Stacking context example 3 - CSS: Cascading Style Sheets
« css « understanding css z-index stacking context example 3 this last example shows problems that arise when mixing several positioned elements in a multi-level html hierarchy and when z-indexes are assigned using class selectors.
... if the three menu levels partially overlap, then managing stacking could become a problem.
... the first-level menu is only relatively positioned, so no stacking context is created.
...And 3 more matches

How to get a stacktrace for a bug report
if you file a bug report in bugzilla about a crash you should include a stacktrace (call stack) in your report.
... a stacktrace will tell mozilla developers what crashed and provide a starting point for investigating its cause.
... this article describes how to use the mozilla crash reporter (breakpad) to get a crash id, which our engineers can use to get a stacktrace, and alternative ways to get a stacktrace if you can't get a crash id.
...And 2 more matches

JS_SetScriptStackQuota
syntax void js_setscriptstackquota(jscontext *cx, size_t quota); name type description cx jscontext * the context to configure.
... quota size_t the desired stack quota setting, in bytes.
... description set the quota on the number of bytes that stack-like data structures can use when the runtime compiles and executes scripts.
...And 2 more matches

nsIStackFrame
inherits from: nsisupports last changed in gecko 1.7 method overview string tostring(); attributes attribute type description caller nsistackframe read only.
...for example, standard language errors would generally have the same location as their top stack entry.
... name string the name of the function at this point in the stack.
...And 2 more matches

Using addresses of stack variables with NSPR threads on win16 - Archive of obsolete content
problem statement win-16 (aka, windows 3.1, et al), is unique in that the architecture depends on the operating environment (i.e., windows) knows the address of the stack, and that there is only one such address.
... consequently, implementing threads, with their implication of a unique stack for each thread, requires that the nspr copy the stacks during thread context switches.
... the actual copying of the stack is not such a hardship as one would imagine.
...what is a hardship is that addresses of dynamic variables, those allocated on the call stack, in a function's local frame, are not valid across thread boundaries.

Stacking with floated blocks - CSS: Cascading Style Sheets
for floated blocks, the stacking order is a bit different.
...this is due to a peculiar part of the specification: applying a opacity value creates a new stacking context (see what no one told you about z-index).

Stacking context - MDN Web Docs Glossary: Definitions of Web-related terms
stacking context refers to how elements on a webpage appear to sit on top of other elements, just as you can arrange index cards on your desk to lie side-by-side or overlap each other.

Components.stack
components.stack is a read only property of type nsistackframe (idl definition) that represents a snapshot of the current javascript callstack.

Stacking without the z-index property - CSS: Cascading Style Sheets
when the z-index property is not specified on any element, elements are stacked in the following order (from bottom to top): the background and borders of the root element descendant non-positioned blocks, in order of appearance in the html descendant positioned elements, in order of appearance in the html keep in mind, when the order property alters rendering from the "order of appearance in the html" within flex containers, it similarly affects the order for stacking context.

Bytecode Descriptions
constants undefined stack: ⇒ undefined push undefined.
... null stack: ⇒ null push null.
... false, true stack: ⇒ true/false push a boolean constant.
...And 214 more matches

DMD
note that stack information you get will likely be less detailed, due to being unable to symbolicate.
...dmd[5222] constructing the stack trace table...
... dmd[5222] constructing the stack frame table...
...And 24 more matches

nsITransactionManager
inherits from: nsisupports last changed in gecko 1.7 method overview void addlistener(in nsitransactionlistener alistener); void beginbatch(); void clear(); void dotransaction(in nsitransaction atransaction); void endbatch(); nsitransactionlist getredolist(); nsitransactionlist getundolist(); nsitransaction peekredostack(); nsitransaction peekundostack(); void redotransaction(); void removelistener(in nsitransactionlistener alistener); void undotransaction(); attributes attribute type description maxtransactioncount long sets the maximum number of transaction items the transaction manager will maintain at any time.
...a value of zero means the transaction manager will execute each transaction, then immediately release all references it has to the transaction without pushing it on the undo stack.
... a value greater than zero indicates the max number of transactions that can exist at any time on both the undo and redo stacks.
...And 22 more matches

MMgc - Archive of obsolete content
write barriers are not needed for stack-based local variables, regardless of whether the object pointed to is gcobject, gcfinalizedobject, rcobject or rcfinalizedobject.
... the gc marks the entire stack during collection, and not incrementally, so write barriers aren't needed.
...write barriers are not needed for c++ objects that exist purely on the stack, and never in the heap.
...And 19 more matches

Profiling with the Firefox Profiler
factors such as sampling or stack-walking variance and system load can lead to sampling delays which manifest as gaps in the timeline.
... y (stack) axis: the y axis is the stack depth, not the cpu activity.
... the change in stack height is useful to find patterns like long blocking calls (long flatlines) or very tall spiky blocks (recursive calls and js).
...And 19 more matches

Setting up your own test automation environment - Learn web development
objective: to show how to set up a selenium testing environment locally and run tests with it, and how to integrate it with tools like lambdatest, sauce labs, and browserstack.
... browser.executescript("lambda-status=failed");​​​​​​ browserstack getting selenium tests to run remotely on browserstack is easy.
... let's write an example: inside your project directory, create a new file called bstack_google_test.js.
...And 15 more matches

Shell global objects
stackpointerinfo() return an int32 value which corresponds to the offset of the latest stack pointer, such that one can take the differences of 2 to estimate a frame-size.
... stackdump(showargs, showlocals, showthisprops) tries to print a lot of information about the current stack.
... similar to the dumpjsstack() function in the browser.
...And 15 more matches

In depth: Microtasks and the JavaScript runtime environment - Web APIs
as each context is created, it is placed on the execution context stack.
... when it exits, the context is removed from the context stack.
... when greetuser("mike") is reached, a context is created for the greetuser() function; this execution context is pushed onto the execution context stack.
...And 14 more matches

Introduction to automated testing - Learn web development
in this article, we look at what is available, how to use task runners, and how to use the basics of commercial browser test automation apps such as lambdatest, sauce labs, browserstack, and testingbot.
...commercial cross-browser testing apps like lambdatest, sauce labs, browserstack, and testingbot are based on selenium, but allow you to access their set up remotely using a simple interface, saving you the hassle of setting up your own testing system.
... note: there are other commercial browser testing systems available but in this article, we'll focus on lambdatest, sauce labs, and browserstack.
...And 13 more matches

SavedFrame
savedframe a savedframe instance is a singly linked list of stack frames.
... it represents a javascript call stack at a past moment of execution.
...savedframe stacks should generally be captured, allocated, and live within the compartment that is being observed or debugged.
...And 13 more matches

Debugger.Frame - Firefox Developer Tools
debugger.frame a debugger.frame instance represents a visible stack frame.
... given a debugger.frame instance, you can find the script the frame is executing, walk the stack to older frames, find the lexical environment in which the execution is taking place, and so on.
...similarly, walking the stack back to a previously accessed frame yields the same frame object as before.
...And 12 more matches

Understanding WebAssembly text format - WebAssembly
(note that when this text gets converted to binary, though, the binary will contain only the integer.) stack machines before we can write a function body, we have to talk about one more thing: stack machines.
... although the browser compiles it to something more efficient, wasm execution is defined in terms of a stack machine where the basic idea is that every type of instruction pushes and/or pops a certain number of i32/i64/f32/f64 values to/from a stack.
... for example, local.get is defined to push the value of the local it read onto the stack, and i32.add pops two i32 values (it implicitly grabs the previous two values pushed onto the stack), computes their sum (modulo 2^32) and pushes the resulting i32 value.
...And 12 more matches

PR_PushIOLayer
adds a layer onto the stack.
... syntax #include <prio.h> prstatus pr_pushiolayer( prfiledesc *stack, prdescidentity id, prfiledesc *layer); parameters the function has the following parameters: stack a pointer to a prfiledesc object representing the stack.
... id a prdescidentity object for the layer on the stack above which the new layer is to be added.
...And 11 more matches

Box-shadow generator - CSS: Cascading Style Sheets
box-shadow generator html content <div id="container"> <div class="group section"> <div id="layer_manager"> <div class="group section"> <div class="button" data-type="add"> </div> <div class="button" data-type="move-up"> </div> <div class="button" data-type="move-down"> </div> </div> <div id="stack_container"></div> </div> <div id="preview_zone"> <div id="layer_menu" class="col span_12"> <div class="button" id="element" data-type="subject" data-title="element"> element </div> <div class="button" id="before" data-type="subject" data-title=":before"> :before <span class="delete" data-type="dis...
...0px auto 0; font-family: "segoe ui", arial, helvetica, sans-serif; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; -moz-user-select: none; -webkit-user-select: none; -ms-user-select: none; } #container { width: 100%; padding: 2px; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; } /* container with shadows stacks */ #stack_container { height: 400px; overflow: hidden; position: relative; border: 1px solid #ccc; border-radius: 3px; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; } #stack_container .container { height: 100%; width: 100%; position: absolute; left: 100%; transition-property: left; transition-duration: 0.5s; -moz-box-sizing: border-box; -...
...webkit-box-sizing: border-box; box-sizing: border-box; } #stack_container .title { text-align: center; font-weight: bold; line-height: 2em; border-bottom: 1px solid #43a6e1; color: #666; } /* * stack of layers for shadow */ #layer_manager { width: 17%; background-color: #fefefe; margin: 0 1% 0 0; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: border-box; float: left; } #layer_manager .button { width: 30%; height: 25px; margin:0 0 10px; color: #333; background-color: #eee; text-align: center; font-size: 0.75em; line-height: 1.5em; border: 1px solid #ccc; border-radius: 3px; display: block; background-position: center center; background-repeat: no-repeat; -moz-box-sizing: border-box; -webkit-box-sizing: border-box; box-sizing: bor...
...And 11 more matches

Index - Archive of obsolete content
681 using addresses of stack variables with nspr threads on win16 nspr, outdated_articles this is a cautionary note that may be old information for some of you.
... 1792 stack positioning tutorials, xul, xul_tutorial this section will describe how to position items in a stack.
... 1793 stacks and decks tutorials, xul, xul_tutorial there may be need to display elements as a set of overlapping cards.
...And 9 more matches

Index
the script must not be currently executing (in any context, at any level of the stack) and must not be used again afterwards.
... 365 js_isassigning jsapi reference, obsolete, reference, référence(2), spidermonkey js_isassigning returns true if a script is executing and its current bytecode is a set (assignment) operation, even if there are native (no script) stack frames between the script and the caller to js_isassigning.
... 425 js_poparguments jsapi_reference, obsolete, spidermonkey js_poparguments frees the stack frame pointer previously allocated by js_pusharguments and unroots the jsvals which have been associated with it (those returned by js_pusharguments as well).
...And 9 more matches

Waterfall - Firefox Developer Tools
javascript functions executed in the page are labeled with the reason the function was called: script tag setinterval settimeout requestanimationframe promise callback promise init worker javascript uri event handler stack call stack, with links to functions.
... stack call stack, with links to functions.
... stack call stack, with links to functions.
...And 9 more matches

Gecko Profiler FAQ
the only way that i’ve tried before is to use a “difference calltree”: in the regular call tree, each node of the calltree is assigned a weight which is just the number of samples that were under this call stack.
... in a difference call tree, each node’s weight instead is computed as <number of samples under this stack in the “after” profile> minus <number of samples under this stack in the “before” profile>.
...then the call stacks whose cost increased the most in the “after” profile will be at the top, and those are the ones you usually want to look at if you caused a regression.
...And 8 more matches

Profiling with Xperf
for stack walking, windows vista or higher is required; i haven't tested it at all on xp.
... for 64-bit windows 7 or vista, you'll need to do a registry tweak and then restart to enable stack walking: reg add "hklm\system\currentcontrolset\control\session manager\memory management" -v disablepagingexecutive -d 0x1 -t reg_dword -f symbol server setup with the latest versions of the windows performance toolkit, you can modify the symbol path directly from within the program via the trace menu.
...start recording data: xperf -on latency -stackwalk profile "latency" is a special provider name that turns on a few predefined kernel providers; run "xperf -providers k" to view a full list of providers and groups.
...And 7 more matches

Refcount tracing and balancing
refcount tracing logs calls to addref and release, preferably for a particular set of classes, including call-stacks in symbolic form (on platforms that support this).
... xpcom_mem_alloc_log for platforms that don't have stack-crawl support, xpcom supports logging at the call site to addref/release using the usual cpp __file__ and __line__ number macro expansion hackery.
...when this is set, along with xpcom_mem_log_classes and xpcom_mem_refcnt_log, a stack track will be generated for only the specific objects that you list.
...And 7 more matches

TraceMalloc
tracemalloc captures stack traces of all malloc, calloc , realloc, and free calls (this currently covers all operator new and delete calls in mozilla, too).
...the built mozilla application will support the following additional command-line options: --trace-malloc filename the application will log allocation and deallocation events with stack traces in a binary format to the given file.
... if filename is -, nothing is written to a file, but tracemalloc will be active and will track live allocations and their stack traces.
...And 7 more matches

Hacking Tips
printing the js stack (from gdb) in jsobj.cpp, a function named js::dumpbacktrace prints a backtrace à la gdb for the js stack.
... the backtrace contains in the following order, the stack depth, the interpreter frame pointer (see js/src/vm/stack.h, stackframe class) or (nil) if compiled with ionmonkey, the file and line number of the call location and under parentheses, the jsscript pointer and the jsbytecode pointer (pc) executed.
...to figure it out you have to read the stack to infer the ionmonkey frame.
...And 7 more matches

Aggregate view - Firefox Developer Tools
there are three main ways to group the data: type call stack inverted call stack you can switch between them using the dropdown menu labeled "group by:" located at the top of the panel: there's also a box labeled "filter" at the top-right of the pane.
...if you select an item, you'll see the retaining paths panel for that item: call stack the call stack shows you exactly where in your code you are making heap allocations.
... because tracing allocations has a runtime cost, it must be explicitly enabled by checking "record call stacks" before you allocate the memory in the snapshot.
...And 7 more matches

Dominators view - Firefox Developer Tools
for example: variables allocated on the stack need to be rooted, or internal caches may need to root their​ elements.
... call stack in the toolbar at the top of the tool is a dropdown called "label by": by default, this is set to "type".
... however, you can set it instead to "call stack" to see exactly where in your code the objects are being allocated.
...And 7 more matches

Drag and Drop Example - Archive of obsolete content
the user can click on one of several xul elements on the palette and drag it onto a stack element to create an element of a particular type.
...the board will be created using a stack element.
... we'll use some style properties to set the width and height of the stack.
...And 6 more matches

Venkman Introduction - Archive of obsolete content
features such as breakpoint management, call stack inspection, and variable/object inspection are available from the user interface and from console commands, letting you work in the way you are most accustomed to.
... the call stack view the call stack view is on the left portion of the window by default, at the bottom.
... when the debugger is stopped, the call stack view displays the list of active functions.
...And 6 more matches

TypeScript support in Svelte - Learn web development
according to stackoverflow's 2019 developer survey it is the third most loved language, right behind rust and python.
...replace the content of the filterbutton.svelte file with the following: <!-- components/filterbutton.svelte --> <script lang='ts'> import { filter } from '../types/filter.enum' export let filter: filter = filter.all </script> <div class="filters btn-group stack-exception"> <button class="btn toggle-btn" class:btn__primary={filter === filter.all} aria-pressed={filter === filter.all} on:click={()=> filter = filter.all} > <span class="visually-hidden">show</span> <span>all</span> <span class="visually-hidden">tasks</span> </button> <button class="btn toggle-btn" class:btn__primary={filter === filter.active} aria-pressed={filter === filter...
... let's see a quick example, a simple stack class that let's us push and pop elements, like this: export class stack { private elements = [] push = (element) => this.elements.push(element) pop() { if (this.elements.length === 0) throw new error('the stack is empty!') return this.elements.pop() } } in this case elements is an array of type any, and accordingly the push() and pop() methods both receive and return a variab...
...And 6 more matches

GC Rooting Guide
gc things on the stack js::rooted<t> all gc thing pointers stored on the stack (i.e., local variables and parameters to functions) must use the js::rooted<t> class.
... these do not need to be wrapped in any of rooting classes, but they should be immediately used to initialize a js::rooted<t> if there is any code that could gc before the end of the containing function; a raw pointer must never be stored on the stack during a gc.
...what will happen is that the return statement will pull the bare jsobject* out of the rooted obj variable and either put it in the stack or store it in the return value register.
...And 6 more matches

JSAPI User Guide
once the c++ function returns false, the javascript engine starts unwinding the javascript stack, looking for a catch or finally block to execute.
... but spidermonkey's stack unwinding never removes application's c++ functions from the stack.
... instead, spidermonkey simply returns false or nullptr to the application, which can then handle the error as it chooses—or just return false to let it propagate further up the stack.
...And 6 more matches

Optimizing Applications For NSPR
windows 3.1 applications always run on a stack provided by windows.
... this means that nspr threads use a shadow stack to preserve context across a thread switch.
... at thread switch time, the stack of the current running thread is copied to other storage associated with that thread and the about-to-be-dispatched thread's stack data is copied back onto the windows stack just before the thread is given control.
...And 5 more matches

PR_PopIOLayer
removes a layer from the stack.
... syntax #include <prio.h> prfiledesc *pr_popiolayer( prfiledesc *stack, prdescidentity id); parameters the function has the following parameters: stack a pointer to a prfiledesc object representing the stack from which the specified layer is to be removed.
... id identity of the layer to be removed from the stack.
...And 5 more matches

NSS API Guidelines
error handling nss 3.0 introduces the concept of an error stack.
... when something goes wrong, the call stack unwinds, with routines returning an error indication.
... each level which flags a problem, adds its own error number to the stack.
...And 5 more matches

Tracing JIT
this is the same as normal recording mode, except that the outermost recorder is placed on a deferred-abort stack.
... when the innermost recorder completes -- successfully or otherwise -- every recorder on the deferred abort stack is aborted.
... first the monitor allocates a native stack for the trace to use, and a state structure containing various key pointers into the spidermonkey interpreter's state, including a pointer to the native stack.
...And 5 more matches

nsIXPConnect
nsistackframe createstackframelocation(in pruint32 alanguage, in string afilename, in string afunctionname, in print32 alinenumber, in nsistackframe acaller); void debugdump(in short depth); void debugdumpevalinjsstackframe(in pruint32 aframenumber, in string asourcetext); void debugdumpjsstack(in prbool showargs, in prbool showlocals, in prbool showthisprops); void deb...
...id); void wrapnativetojsval(in jscontextptr ajscontext, in jsobjectptr ascope, in nsisupports acomobj, in nswrappercacheptr acache, in nsiidptr aiid, in boolean aallowwrapper, out jsval aval, out nsixpconnectjsobjectholder aholder); attributes attribute type description collectgarbageonmainthreadonly prbool obsolete since gecko 1.9 currentjsstack nsistackframe read only.
... return value missing description exceptions thrown missing exception missing description createstackframelocation() nsistackframe createstackframelocation( in pruint32 alanguage, in string afilename, in string afunctionname, in print32 alinenumber, in nsistackframe acaller ); parameters alanguage missing description afilename missing description afunctionname missing description alinenumber missing description acaller missing description return value missing descripti...
...And 5 more matches

Adding sidebars - Archive of obsolete content
they allow you to stack content on top of other content and switch between different sections easily.
... decks and stacks sometimes you'll need finer grained control than the one provided by a tabbox.
... we recommend that you use hbox or vbox elements as children of a deck or stack.
...And 4 more matches

right - Archive of obsolete content
« xul reference home right type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the right edge of the element relative to the right edge of the stack.
... positive values are to the left; negative values are to the right of the right edge of the stack.
... this location is specified with respect to the right edge of the stack prior to the element being evaluated, or added to the stack.
...And 4 more matches

Beginning our React todo list - Learn web development
the jsx copy the following snippet to your clipboard, then paste it into app.js so that it replaces the existing app() function: function app(props) { return ( <div classname="todoapp stack-large"> <h1>todomatic</h1> <form> <h2 classname="label-wrapper"> <label htmlfor="new-todo-input" classname="label__lg"> what needs to be done?
... </label> </h2> <input type="text" id="new-todo-input" classname="input input__lg" name="text" autocomplete="off" /> <button type="submit" classname="btn btn__primary btn__lg"> add </button> </form> <div classname="filters btn-group stack-exception"> <button type="button" classname="btn toggle-btn" aria-pressed="true"> <span classname="visually-hidden">show </span> <span>all</span> <span classname="visually-hidden"> tasks</span> </button> <button type="button" classname="btn toggle-btn" aria-pressed="false"> <span classname="visually-hidden">show </span> <span>active</span> <span classname="v...
... </button> <button type="button" classname="btn toggle-btn" aria-pressed="false"> <span classname="visually-hidden">show </span> <span>completed</span> <span classname="visually-hidden"> tasks</span> </button> </div> <h2 id="list-heading"> 3 tasks remaining </h2> <ul role="list" classname="todo-list stack-large stack-exception" aria-labelledby="list-heading" > <li classname="todo stack-small"> <div classname="c-cb"> <input id="todo-0" type="checkbox" defaultchecked={true} /> <label classname="todo-label" htmlfor="todo-0"> eat </label> </div> <div classname="btn-group"> <button type="bu...
...And 4 more matches

Starting our Svelte Todo list app - Learn web development
copy and paste the following into our todos.svelte component file, replacing the existing content: <!-- todos.svelte --> <div class="todoapp stack-large"> <!-- newtodo --> <form> <h2 class="label-wrapper"> <label for="todo-0" class="label__lg"> what needs to be done?
... </label> </h2> <input type="text" id="todo-0" autocomplete="off" class="input input__lg" /> <button type="submit" disabled="" class="btn btn__primary btn__lg"> add </button> </form> <!-- filter --> <div class="filters btn-group stack-exception"> <button class="btn toggle-btn" aria-pressed="true"> <span class="visually-hidden">show</span> <span>all</span> <span class="visually-hidden">tasks</span> </button> <button class="btn toggle-btn" aria-pressed="false"> <span class="visually-hidden">show</span> <span>active</span> <span class="visually-hidden">tasks</span> </button> <button class="btn toggle-btn" aria-pressed="false"> <span class="visually-hidden">show</span> <span>completed</span>...
... <span class="visually-hidden">tasks</span> </button> </div> <!-- todosstatus --> <h2 id="list-heading">2 out of 3 items completed</h2> <!-- todos --> <ul role="list" class="todo-list stack-large" aria-labelledby="list-heading"> <!-- todo-1 (editing mode) --> <li class="todo"> <div class="stack-small"> <form class="stack-small"> <div class="form-group"> <label for="todo-1" class="todo-label"> new name for 'create a svelte starter app' </label> <input type="text" id="todo-1" autocomplete="off" class="todo-text" /> </div> <div class="btn-group"> <button class="btn todo-cancel" type="button"> cancel <span class="visually-hidden">renami...
...And 4 more matches

Rhino Debugger
moving up and down the stack the lower-left (dockable) pane in the debugger main window contains a combo-box labeled "context:" which displays the current stack of the executing script.
... you may move up and down the stack by selecting an entry in the combo-box.
... when you select a stack frame the variables and watch windows are updated to reflect the names and values of the variables visible at that scope.
...And 4 more matches

WebIDL bindings
the dictionary members and sequence elements are guaranteed to be marked by whomever puts the sequence or dictionary on the stack, using sequencerooter and dictionaryrooter.
...the dictionary members and sequence elements are guaranteed to be marked by whoever puts the sequence or dictionary on the stack, using sequencerooter and dictionaryrooter.
...if areportexceptions is set to erethrowexceptions, js exceptions will be stashed in the errorresult and will be reported when the stack unwinds to wherever the errorresult was set up.
...And 4 more matches

Debugger-API - Firefox Developer Tools
it operates on javascript objects, stack frames, environments, and code, and presents a consistent interface regardless of whether the debuggee is interpreted, compiled, or optimized.
... debugger instances and shadow objects debugger reflects every aspect of the debuggee’s state as a javascript value—not just actual javascript values like objects and primitives, but also stack frames, environments, scripts, and compilation units, which are not normally accessible as objects in their own right.
... a debugger.frame represents a running stack frame.
...And 4 more matches

Understanding CSS z-index - CSS: Cascading Style Sheets
the z position of each layer is expressed as an integer representing the stacking order for rendering.
...this is due to complex stacking rules.
... stacking without the z-index property: the stacking rules that apply when z-index is not used.
...And 4 more matches

position - CSS: Cascading Style Sheets
this value creates a new stacking context when the value of z-index is not auto.
... this value creates a new stacking context when the value of z-index is not auto.
... this value always creates a new stacking context.
...And 4 more matches

z-index - CSS: Cascading Style Sheets
for a positioned box (that is, one with any position other than static), the z-index property specifies: the stack level of the box in the current stacking context.
... whether the box establishes a local stacking context.
... values auto the box does not establish a new local stacking context.
...And 4 more matches

Concurrency model and the event loop - JavaScript
visual representation stack function calls form a stack of frames.
...when foo returns, the top frame element is popped out of the stack (leaving only bar's call frame).
... when bar returns, the stack is empty.
...And 4 more matches

console/traceback - Archive of obsolete content
the stack is represented as an array in which the most recent stack frame is the last element; each element thus represents a stack frame and has the following keys: filename the name of the file that the stack frame takes place in.
... lineno the line number is being executed at the stack frame.
... funcname the name of the function being executed at the stack frame, or null if the function is anonymous or the stack frame is being executed in a top-level script or module.
...And 3 more matches

Componentizing our Svelte app - Learn web development
add the following content into the file: <script> export let filter = 'all' </script> <div class="filters btn-group stack-exception"> <button class="btn toggle-btn" class:btn__primary={filter === 'all'} aria-pressed={filter === 'all'} on:click={()=> filter = 'all'} > <span class="visually-hidden">show</span> <span>all</span> <span class="visually-hidden">tasks</span> </button> <button class="btn toggle-btn" class:btn__primary={filter === 'active'} aria-pressed={filter === 'active'} on:click={()=> f...
... put the following contents inside this file: <script> export let todo </script> <div class="stack-small"> <div class="c-cb"> <input type="checkbox" id="todo-{todo.id}" on:click={() => todo.completed = !todo.completed} checked={todo.completed} /> <label for="todo-{todo.id}" class="todo-label">{todo.name}</label> </div> <div class="btn-group"> <button type="button" class="btn"> edit <span class="visually-hidden">{todo.name}</span> </button> <butto...
... update the {#each} block inside todos.svelte like so: <ul role="list" class="todo-list stack-large" aria-labelledby="list-heading"> {#each filtertodos(filter, todos) as todo (todo.id)} <li class="todo"> <todo {todo} /> </li> {:else} <li>nothing to do here!</li> {/each} </ul> the list of todos is displayed on the page, and the checkboxes should work (try checking/unchecking a couple, and then observing that the filters still work as expected), but our "x out of...
...And 3 more matches

Investigating leaks using DMD heap scan mode
firefox’s dmd heap scan mode tracks the set of all live blocks of malloc-allocated memory and their allocation stacks, and allows you to log these blocks, and the values stored in them, to a file.
...non-optimized dmd builds will generate better stack traces, but they can be so slow as to be useless.
...stacks need to be symbolicated, and we need to clamp the values contained in the heap.
...And 3 more matches

dtrace
sudo dtrace -n 'mach_kernel::wakeup { @[ustack()] = count(); }' -p $firefox_pid > $output_file let's break that down further.
... the above code counts unique stack traces when wakeups occur; ustack is short for "user stack", i.e.
... the stack of the userspace program executing.
...And 3 more matches

NSS 3.24 release notes
for functions that use temporary arenas, allocating a portcheaparena on the stack is more performant than allocating a plarenapool on the heap.
... rather than declaring a plarenapool pointer and calling port_newarena/port_freearena to allocate or free an instance on the heap, declare a portcheaparenapool on the stack and use port_initcheaparena/port_destroycheaparena to initialize and destroy it.
... items allocated from the arena are still created on the heap, only the arena itself is stack-allocated.
...And 3 more matches

Bytecodes
the javascript frontend constructs an ast from the source text, then emits stack-based bytecodes from that ast as a part of the jsscript data structure.
...within the engine, all bytecode execute within a stack frame -- even global (top-level) and eval code has a stack frame associated with it.
... a frame on the stack has space for javascript values (the tagged value format) in a few different categories.
...And 3 more matches

Invariants
(the jsval encoding depends on this.) the jsstackframe::down chain never forms a cycle.
... (it's a stack.
... but note that a stack frame is not necessarily newer than the next stack frame down, thanks to generators!) an object's scope chain (found by chasing jsobject::fslots[jsslot_parent]) never forms a cycle.
...And 3 more matches

Web Replay
snapshots late in process initialization the first snapshot is taken, which is simply a copy of the stacks/registers for each thread.
... each subsequent snapshot includes copies of thread stacks/registers as well as a diff containing the original contents of all pages of heap and static memory that were modified since the previous snapshot.
... once all thread are idle, the main thread computes the memory diff, reads the stacks from each thread and their register state (which each thread recorded by calling setjmp before idling).
...And 3 more matches

Exploitable crashes
you want to look primarily for three things, in order: look at the top frame of the stack trace.
... if you see a hex address such as 0x292c2830 rather than a function name such as nslistboxbodyframe::getrowcount at the top of the stack, a bug has caused the program to transfer control to a "random" part of memory that isn't part of the program.
...this is typically located right above the stack trace.
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Mozilla internal string guide
but is not reference counted, because it came from somewhere else) dependent buffers, that is, an underlying buffer that the string class does not own, but that the caller that constructed the string guarantees will outlive the string instance in addition, there is a special string class, ns[c]autostring, that additionally contains an internal 64-unit buffer (intended primarily for use on the stack), leading to a fourth ownership model: storage within an auto string's stack buffer auto strings will prefer reference counting an existing reference-counted buffer over their stack buffer, but will otherwise use their stack buffer for anything that will fit in it.
...some of these classes look like functions, because they are most often used as temporary objects on the stack.
... // call handlepage(const nsastring&); // safe because the concatenated-string will live as long as its substrings handlepage(u"start "_ns + u"end"_ns); local variables local variables within a function are usually stored on the stack.
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Mozilla
(to get a process dump for thunderbird or some other product, substitute the product name where ever you see firefox in these instructions.) how to get a stacktrace for a bug report if you file a bug report in bugzilla about a crash you should include a stacktrace (call stack) in your report.
... a stacktrace will tell mozilla developers what crashed and provide a starting point for investigating its cause.
... this article describes how to use the mozilla crash reporter (breakpad) to get a crash id, which our engineers can use to get a stacktrace, and alternative ways to get a stacktrace if you can't get a crash id.
...And 3 more matches

Debugger.Memory - Firefox Developer Tools
debugger.memory the debugger api can help tools observe the debuggee’s memory use in various ways: it can mark each new object with the javascript call stack at which it was allocated.
... it can log all object allocations, yielding a stream of javascript call stacks at which allocations have occurred.
... allocation site tracking the javascript engine marks each new object with the call stack at which it was allocated, if: the object is allocated in the scope of a global object that is a debuggee of some debugger instancedbg; and dbg.memory.trackingallocationsites is set to true.
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Debugger - Firefox Developer Tools
changing this flag when any frame of the debuggee is currently active on the stack will produce an exception.
...the promise’s allocation stack can be obtained using the promiseallocationstack accessor property of the debugger.object instance promise.
...the promise’s state, fulfillment or rejection value, and the allocation and resolution stacks can be obtained using the promise-related accessor properties of the debugger.object instance promise.
...And 3 more matches

Index - Firefox Developer Tools
20 debugger.frame a debugger.frame instance represents a visible stack frame.
... given a debugger.frame instance, you can find the script the frame is executing, walk the stack to older frames, find the lexical environment in which the execution is taking place, and so on.
...it periodically samples the state of the javascript engine and records the stack for the code executing at the time.
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Index - Web APIs
592 canvasrenderingcontext2d.restore() api, canvas, canvasrenderingcontext2d, method, reference the canvasrenderingcontext2d.restore() method of the canvas 2d api restores the most recently saved canvas state by popping the top entry in the drawing state stack.
... 594 canvasrenderingcontext2d.save() api, canvas, canvasrenderingcontext2d, method, reference the canvasrenderingcontext2d.save() method of the canvas 2d api saves the entire state of the canvas by pushing the current state onto a stack.
... 1989 state api, html, history api, property, reference returns an any value representing the state at the top of the history stack.
...And 3 more matches

Using CSS gradients - CSS: Cascading Style Sheets
colorhint-gradient"></div> <div class="regular-progression"></div> div { width: 120px; height: 120px; float: left; margin-right: 10px; box-sizing: border-box; } .colorhint-gradient { background: linear-gradient(to top, black, 20%, cyan); } .regular-progression { background: linear-gradient(to top, black, cyan); } overlaying gradients gradients support transparency, so you can stack multiple backgrounds to achieve some pretty fancy effects.
... the backgrounds are stacked from top to bottom, with the first specified being on top.
... <div class="layered-image"></div> div { width: 300px; height: 150px; } .layered-image { background: linear-gradient(to right, transparent, mistyrose), url("https://mdn.mozillademos.org/files/15525/critters.png"); } stacked gradients you can even stack gradients with other gradients.
...And 3 more matches

Error - JavaScript
static methods error.capturestacktrace() a non-standard v8 function that creates the stack property on an error instance.
... error.prototype.stack a non-standard mozilla property for a stack trace.
... see "what's a good way to extend error in javascript?" on stackoverflow for an in-depth discussion.
...And 3 more matches

Appendix D: Loading Scripts - Archive of obsolete content
in stack traces, the script will appear to have been loaded from the file "zz-9://plural/zed/alpha", line 42.
...xtras/xmlhttprequest;1", "nsixmlhttprequest", "open"); function loadscript(name, context) { // create the sandbox let sandbox = components.utils.sandbox(context, { sandboxprototype: context, wantxrays: false }); // get the caller's filename let file = components.caller.stack.filename; // strip off any prefixes added by the sub-script loader // and the trailing filename let directory = file.replace(/.* -> |[^\/]+$/g, ""); let scriptname = directory + name; // read the script let xmlhttp = xmlhttprequest("get", scriptname, false); xmlhttp.overridemimetype("text/plain"); xmlhttp.send(); let script = xmlhttp.textcontent; // evalu...
...for instance, the file “resource://foo/bar.js” loaded from “resource://foo/baz.js” will appear as “resource://foo/baz.js -> resource://foo/bar.js” in stack traces.
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Index - Archive of obsolete content
1061 stack positioning tutorials, xul, xul_tutorial this section will describe how to position items in a stack.
... 1062 stacks and decks tutorials, xul, xul_tutorial there may be need to display elements as a set of overlapping cards.
... the stack and deck elements can be used for this purpose.
...And 2 more matches

Componentizing our React app - Learn web development
go back to src/app.js, copy the first <li> from inside the unordered list, and paste it into todo.js so that it reads like this: export default function todo() { return ( <li classname="todo stack-small"> <div classname="c-cb"> <input id="todo-0" type="checkbox" defaultchecked={true} /> <label classname="todo-label" htmlfor="todo-0"> eat </label> </div> <div classname="btn-group"> <button type="button" classname="btn"> edit <span classname="visually-hidden">eat</span> </button> <button type="button" class...
...your <ul> should read like this: <ul role="list" classname="todo-list stack-large stack-exception" aria-labelledby="list-heading" > <todo /> <todo /> <todo /> </ul> when you look back at your browser, you'll notice something unfortunate: your list now repeats the first task three times!
... putting all that together, your todo() function should read like this: export default function todo(props) { return ( <li classname="todo stack-small"> <div classname="c-cb"> <input id="todo-0" type="checkbox" defaultchecked={true} /> <label classname="todo-label" htmlfor="todo-0"> {props.name} </label> </div> <div classname="btn-group"> <button type="button" classname="btn"> edit <span classname="visually-hidden">{props.name}</span> </button> <button t...
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Leak-hunting strategies and tips
it may just involve setting the xpc_shutdown_heap_dump environment variable to a file name, but i haven't tested that.) post-processing of stack traces on mac and linux, the stack traces generated by our internal debugging tools don't have very good symbol information (since they just show the results of dladdr).
... the stacks can be significantly improved (better symbols, and file name / line number information) by post-processing.
... stacks can be piped through the script tools/rb/fix_stacks.py to do this.
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How to embed the JavaScript engine
, js_deletepropertystub, js_propertystub, js_strictpropertystub, js_enumeratestub, js_resolvestub, js_convertstub, }; int main(int argc, const char *argv[]) { jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
..., js_resolvestub, js_convertstub, nullptr, nullptr, nullptr, nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024, js_use_helper_threads); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
... nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, nullptr, js_globalobjecttracehook }; int main(int argc, const char *argv[]) { js_init(); jsruntime *rt = js_newruntime(8l * 1024 * 1024); if (!rt) return 1; jscontext *cx = js_newcontext(rt, 8192); if (!cx) return 1; { // scope for our various stack objects (jsautorequest, rootedobject), so they all go // out of scope before we js_destroycontext.
...And 2 more matches

Garbage collection
mark bits are allocated based on the minimum cell size, thus an object comprised of larger cells consumes multiple bits in the bitmap (but only uses two of them.) exact stack rooting api note: the information here is about the implementation of gc roots and their use within spidermonkey.
... this information has been split out into a separate article: exact stack rooting.
...the barrier marks the pointed-to object black, and pushes any outgoing edges onto the mark stack.
...And 2 more matches

JS::CompileOptions
description in the most common use case, a compileoptions instance is allocated on the stack, and holds non-owning references to non-pod option values: strings; principals; objects; and so on.
... in some cases, however, we need to hold compilation options with a non-stack-like lifetime.
... the usual compileoptions class must be stack-allocated, and holds non-owning references to the filename, element, and so on.
...And 2 more matches

Index
29 components.stack xpcom:language bindings, xpconnect components.stack is a read only property of type nsistackframe (idl definition) that represents a snapshot of the current javascript callstack.
... 191 inidomutils interfaces, interfaces:scriptable, reference, xpcom, xpcom interface reference implemented by: @mozilla.org/inspector/dom-utils;1 as a service: 192 jsdistackframe interfaces, interfaces:scriptable, needscontent, needshelp, xpcom, xpcom interface reference strict mode is on.
...stack frame objects.
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UI Tour - Firefox Developer Tools
the ui is split vertically into three panels source list pane source pane the contents of the third pane depend on the current state of the debugger and may include the following sections: toolbar watch expressions breakpoints call stack scopes xhr breakpoints event listener breakpoints dom mutation breakpoints source list pane the source list pane lists all the javascript source files loaded into the page, and enables you to select one to debug.
...they will be evaluated when code execution is paused: variable tooltip hover on a variable show a tooltip with its value inside: call stack when the debugger's paused, you'll see a call stack: each level of the call stack gets a line, with the name of the function and the filename and line number.
... right-clicking in the call stack pane opens a context menu with the following items: restart frame restarts execution at the beginning of the current frame.
...And 2 more matches

Transformations - Web APIs
canvas states are stored on a stack.
... every time the save() method is called, the current drawing state is pushed onto the stack.
...each time the restore() method is called, the last saved state is popped off the stack and all saved settings are restored.
...And 2 more matches

Window: popstate event - Web APIs
it changes the current history entry to that of the last page the user visited or, if history.pushstate() has been used to add a history entry to the history stack, that history entry is used instead.
... bubbles yes cancelable no interface popstateevent event handler property onpopstate the history stack if the history entry being activated was created by a call to history.pushstate() or was affected by a call to history.replacestate(), the popstate event's state property contains a copy of the history entry's state object.
... these methods and their corresponding events can be used to add data to the history stack which can be used to reconstruct a dynamically generated page, or to otherwise alter the state of the content being presented while remaining on the same document.
...And 2 more matches

Using z-index - CSS: Cascading Style Sheets
the first part of this article, stacking without the z-index property, explains how stacking is arranged by default.
... if you want to create a custom stacking order, you can use the z-index property on a positioned element.
...if you are not familiar with the z-axis, imagine the page as a stack of layers, each one having a number.
...And 2 more matches

Functions - JavaScript
providing a name allows the function to refer to itself, and also makes it easier to identify the function in a debugger's stack traces: const factorial = function fac(n) { return n < 2 ?
... num2 = 3, name = 'chamahk'; // this function is defined in the global scope function multiply() { return num1 * num2; } multiply(); // returns 60 // a nested function example function getscore() { var num1 = 2, num2 = 3; function add() { return name + ' scored ' + (num1 + num2); } return add(); } getscore(); // returns "chamahk scored 5" scope and the function stack recursion a function can refer to and call itself.
... it is possible to convert any recursive algorithm to a non-recursive one, but the logic is often much more complex, and doing so requires the use of a stack.
...And 2 more matches

Chapter 3: Introduction to XUL—How to build a more intuitive UI - Archive of obsolete content
<button label="vertical2"/> </vbox> <label value="mixed"/> <hbox> <button label="mixed1"/> <vbox> <button label="mixed2"/> <button label="mixed3"/> </vbox> <button label="mixed4"/> </hbox> listing 3: horizontal and vertical boxes figure 1: output of listing 3 there is also a grid element, which can be used for layouts similar to those achieved using the html table element, a stack element for layering other elements, and so on.
... <grid> <columns> <column/> <column flex="1"/> </columns> <rows> <row align="center"> <label value="user id"/> <textbox/> </row> <row align="center"> <label value="name"/> <textbox/> </row> </rows> </grid> listing 20: layout using the grid figure 16: output from listing 20 stack use the stack element to overlap multiple widgets.
... the stack element differs from a normal box in that all the elements in it are layered over each other, working from the bottom up.
... <stack> <progressmeter mode="normal" value="50"/> <hbox align="center"> <label value="in progress…"/> </hbox> </stack> listing 21: overlapping with stack figure 17: progress bar tab use the tab element to divide multiple pages, as used in the properties dialog; use the tabbox element to group related elements.

LIR - Archive of obsolete content
3 parami integer 32 bit load an int parameter (register or stack location).
... 4 paramq quad 64 bit load a quad parameter (register or stack location).
... 5 allocp pointer allocate stack space (result is an address) 6 reti void return an int 7 retq void 64 bit return a quad 8 retd void return a double 9 livei void extend live range of an int 10 liveq void 64 bit extend live range of a quad 11 lived void extend live range of a double 12 file void source filename for debug symbols 13 line void source line number for debug symbols 14 comment void a comment shown, on its own line, in lir dumps 15 not in use load 16 not in use 17 ldc2i integer load char and sign-extend to an int 18 lds2i integer load short and sign-extend to an int 19 lduc2ui i...
...code is emitted for this) 42 not in use guards 43 x void exit always 44 xt void exit if true 45 xf void exit if false 46 xtbl void exit via indirect jump 47 xbarrier void a lir_xbarrier cause no code to be generated, but it acts like a never-taken guard in that it inhibits certain optimisations, such as dead stack store elimination.

Adding Methods to XBL-defined Elements - Archive of obsolete content
for example: xul: <box id="outer" class="container"> <button label="one"/> <button label="two"/> <button label="three"/> <button label="four"/> </box> xbl: <binding id="labeledbutton"> <content> <description value="a stack:"/> <stack> <children/> </stack> </content> </binding> if you use the dom functions such as childnodes to get the children of the the xul box element with the id of outer, you willl find that it has has 4 children.
... these correspond to its four buttons, even though those buttons are drawn inside the stack.
... the stack has only one child, the children element itself.
... the length of the anonymous array of the outer box is two, the first element the description element and the second the stack element.

Positioning - Learn web development
it is also stacked below the original .positioned paragraph, where the two overlap.
... can you change the stacking order?
...z-index values affect where positioned elements sit on that axis; positive values move them higher up the stack, and negative values move them lower down the stack.
... to change the stacking order, try adding the following declaration to your p:nth-of-type(1) rule: z-index: 1; you should now see the finished example, with the lime paragraph on top: <h1>z-index</h1> <p>i am a basic block level element.

Server-side web frameworks - Learn web development
popular sites using django (from django home page) include: disqus, instagram, knight foundation, macarthur foundation, mozilla, national geographic, open knowledge foundation, pinterest, open stack.
... many popular server-side and full stack frameworks (comprising both server and client-side frameworks) are based on express, including feathers, itemsapi, keystonejs, kraken, loopback, mean, and sails.
... asp.net is used by microsoft, xbox.com, stack overflow, and many others.
... a full-stack http and websocket client/server implementation with ipv6, tls, sni, idna, http/socks5 proxy, unix domain socket, comet (long polling), keep-alive, connection pooling, timeout, cookie, multipart, and gzip compression support.

source-editor.jsm
object aconfig, function acallback); search operations number find(string astring, [optional] object options); number findnext(boolean awrap); number findprevious(boolean awrap); event management void addeventlistener(string aeventtype, function acallback); void removeeventlistener(string aeventtype, function acallback); undo stack operations boolean canredo(); boolean canundo(); void endcompoundchange(); boolean redo(); void resetundo(); void startcompoundchange(); boolean undo(); display management operations void focus(); number gettopindex(); boolean hasfocus(); void settopindex(number atopindex); content ...
... resetundo resets the undo stack, removing all possible undo and redo operations from the stack.
...all changes made between a call to startcompoundchange() and its corresponding call to endcompoundchange() are considered to be a single operation on the undo stack.
... undolimit number a number indicating how many steps the undo stack should hold.

I/O Functions
a layer can be pushed onto or popped from an existing stack of layers.
... pr_top_io_layer: the identity of the top of the stack.
... pr_top_io_layer may be used as a shorthand for identifying the topmost layer of an existing stack.
... for example, the following lines of code are equivalent: rv = pr_pushiolayer(stack, pr_top_io_layer, my_layer); rv = pr_pushiolayer(stack, pr_getlayersidentity(stack), my_layer); pr_getuniqueidentity pr_getnameforidentity pr_getlayersidentity pr_getidentitieslayer pr_getdefaultiomethods pr_createiolayerstub pr_pushiolayer pr_popiolayer ...

PR_AttachThread
the opaque prthreadstack structure is only used in the third argument "prthreadstack *stack" to the pr_attachthread function.
... the 'stack' argument is now obsolete and ignored by pr_attachthread.
... you should pass null as the 'stack' argument to pr_attachthread.
... syntax #include <prthread.h> typedef struct prthreadstack prthreadstack; ...

PR_GetIdentitiesLayer
finds the layer with the specified identity in the specified stack of layers.
... syntax #include <prio.h> prfiledesc* pr_getidentitieslayer( prfiledesc* stack, prdescidentity id); parameters the function has the following parameters: stack a pointer to a prfiledesc object that is a layer in a stack of layers.
... returns the function returns one of the following values: if successful, a pointer to a file descriptor of the layer with the specified identity in the given stack of layers.
... description the stack of layers to be searched is specified by the fd parameter, which is a layer in the stack.

NSS Memory allocation
leak analysis tools will frequently report the wrong call stack for the allocation of leaked arenas.
...if and when an arena is leaked, the developer wants to see the call stack of the most recent allocation of the arena, not the stack of the oldest allocation of that arena.
...consequently, when the arena free list is in use, the allocation call stacks shown will typically not be the stack of the code that most recently allocated that arena, but rather will be the stack of the code that first allocated that arena from the heap, and then placed it on the free list.
...this makes nss slower, but produces accurate leak allocation stacks.

JSFastNative
(the return value and the callee are stored in the same stack slot.) js_this(cx, vp) returns the this argument as a jsval, or jsval_null on error.
... when a jsfastnative is called, no jsstackframe is generated.
...however, it causes the function not to appear on the stack in javascript debuggers.
... it also means that applications that use spidermonkey's security features, particularly those that implement jscheckaccessop or jscheckaccessidop in terms of apis such as js_frameiterator and js_stackframeprincipals, must take extra care, as the native function's principals will be missing from the stack.

JS_NewContext
syntax jscontext * js_newcontext(jsruntime *rt, size_t stackchunksize); name type description rt jsruntime * parent runtime for the new context.
... stackchunksize size_t the size, in bytes, of each "stack chunk".
... the stackchunksize parameter does not control the javascript stack size.
... (the jsapi does not provide a way to adjust the stack depth limit.) passing a large number for stackchunksize is a mistake.

SpiderMonkey 1.8.5
garbage collection spidermonkey 1.8.5 introduces a conservative stack-scanning garbage collector.
... unlike the exact garbage collector, the new garbage collector will scan the c stack and registers in your embedding, looking for bits that it can treat as potential gc roots.
...a conservative stack-scanning collector was also added for spidermonkey 1.8.5, making the *localrootscope apis obsolete; they are now nops.
... bug 614138 introduces a c++ js::anchor<> template class to help tie lexical scope to the conservative gc for cases where the compiler might optimize away important stack/register roots (such as when we access the jschars in a jsstring).

SpiderMonkey 1.8.7
xxx all sections below need updating garbage collection spidermonkey 1.8.5 introduces a conservative stack-scanning garbage collector.
... unlike the exact garbage collector, the new garbage collector will scan the c stack and registers in your embedding, looking for bits that it can treat as potential gc roots.
... a conservative stack-scanning collector was also added for spidermonkey 1.8.5, making the *localrootscope apis obsolete; they are now nops.
... bug 614138 introduces a c++ js::anchor<> template class to help tie lexical scope to the conservative gc for cases where the compiler might optimize away important stack/register roots (such as when we access the jschars in a jsstring).

XPCOM array guide
for example, here is its use in a class: class nodecontainer { public: void addnode(nsinode* node); private: nscomarray<nsinode> mnodes; }; // typesafety of mnodes ensures that we only append an nsinode* void nodecontainer::addnode(nsinode* node) { mnodes.appendobject(node); } nscomarray<t> can also be declared on the stack to collect a temporary list of objects and manipulate them.
... void processvisibleitems() { // temporary stack-based nscomarray nscomarray<nsifoo> fooitems; getcompletelist(fooitems); // now filter out non visible objects // doing this backwards pruint32 i = fooitems.count(); while (i > 0) { --i; prbool isvisible; fooitems[i]->getisvisible(&isvisible); if (!isvisible) { fooitems.removeobjectat(i); } } // now deal with the processed list processlist(fooitems); // fooitems will release all its members // when it goes out of scope } access to elements nscomarray<t> is a concrete c++ class, and so the [] operator is used to access its members.
... for example, here is its use in a class: class medialist { public: void addmedium(const nsstring& amedium); private: nstarray<nsstring> mmedia; }; // typesafety of mmedia ensures that we only append an nsstring void nodecontainer::addmedium(const nsstring& amedium) { mmedia.appendelement(amedium); } nstarray<t> can also be declared on the stack to collect a temporary list of objects and manipulate them.
... void processvisibleitems() { // temporary stack-based nstarray nstarray<foostruct> fooitems; getcompletelist(fooitems); // now filter out non visible objects // doing this backwards pruint32 i = fooitems.length(); while (i > 0) { --i; prbool isvisible; fooitems[i]->getisvisible(&isvisible); if (!isvisible) { fooitems.removeelementat(i); } } // now deal with the processed list processlist(fooitems); // fooitems will call the destructors of all the foostruct objects ...

nsITransactionListener
didmerge() called after a nsitransactionmanager tries to merge a transaction, that was just executed, with the transaction at the top of the undo stack.
...atoptransaction the transaction at the top of the undo stack.
... return value willmerge() called before a nsitransactionmanager tries to merge a transaction, that was just executed, with the transaction at the top of the undo stack.
...atoptransaction the transaction at the top of the undo stack.

nsIXPCException
inherits from: nsiexception last changed in gecko 1.9.2 (firefox 3.6 / thunderbird 3.1 / fennec 1.0) method overview void initialize(in string amessage, in nsresult aresult, in string aname, in nsistackframe alocation, in nsisupports adata, in nsiexception ainner); xpcexjsval stealjsval(); native code only!
... methods initialize() void initialize( in string amessage, in nsresult aresult, in string aname, in nsistackframe alocation, in nsisupports adata, in nsiexception ainner ); parameters amessage aresult aname alocation adata ainner native code only!stealjsval xpcexjsval stealjsval(); parameters none.
...the call signature of the constructor is: components.exception(message, result, stack, data, inner) all parameters are optional and the appropriate placeholder is 'unknown'.
... message - a custom message set by the thrower (defaults to 'exception') result - the nsresult associated with this exception (defaults to components.results.ns_error_failure) stack - the stack chain (defaults to the current stack) data - additional data object of your choice (defaults to null) inner - an inner exception that triggered this, if available ...

Tutorial: Show Allocations Per Call Path - Firefox Developer Tools
plot(log); } function handleuncaughtexception(ex) { console.log('debugger hook threw:'); console.log(ex.tostring()); console.log('stack:'); console.log(ex.stack); }; function plot(log) { // given the log, compute a map from allocation sites to // allocation counts.
... note that stack entries are '===' if // they represent the same site with the same callers.
...the saved stacks // are new, and firefox doesn't yet understand that they // are safe for chrome code to use, so we must tell it // so explicitly.
... var totals = new map; for (let [site, count] of counts) { for(;;) { if (!totals.has(site)) totals.set(site, 0); totals.set(site, totals.get(site) + count); if (!site) break; site = site.parent; } } // compute parent-to-child links, since saved stack frames // have only parent links.

Flame Chart - Firefox Developer Tools
the flame chart shows you the state of the javascript stack for your code at every millisecond during the performance profile.
... the call tree and the flame chart are both used to analyze your site's javascript, and they both use the same data: a sample of the javascript engine's stack, taken periodically during the recording.
...essentially it shows you the state of the call stack at any given point during the recording.
...along the y-axis are the functions on the call stack at that point in time, with the top-level at the top, and the leaf function at the bottom.

isolation - CSS: Cascading Style Sheets
the isolation css property determines whether an element must create a new stacking context.
... values auto a new stacking context is created only if one of the properties applied to the element requires it.
... isolate a new stacking context must be created.
...in svg, it applies to container elements, graphics elements, and graphics referencing elements.inheritednocomputed valueas specifiedanimation typediscrete formal syntax auto | isolate examples forcing a new stacking context for an element html <div id="b" class="a"> <div id="d"> <div class="a c">auto</div> </div> <div id="e"> <div class="a c">isolate</div> </div> </div> css .a { background-color: rgb(0,255,0); } #b { width: 200px; height: 210px; } .c { width: 100px; height: 100px; border: 1px solid black; padding: 2px; mix-blend-mode: difference; } #d { isolation: auto; } #e { isolation: isolate; } result specifications specification status comment composi...

Promise.all() - JavaScript
this returned promise is then resolved/rejected asynchronously (as soon as the stack is empty) when all the promises in the given iterable have resolved, or if any of the promises reject.
...this will be counted as if the iterable passed contains only the resolved promise with value "444", so it gets fulfilled var p2 = promise.all([1,2,3, promise.resolve(444)]); // this will be counted as if the iterable passed contains only the rejected promise with value "555", so it gets rejected var p3 = promise.all([1,2,3, promise.reject(555)]); // using settimeout we can execute code after the stack is empty settimeout(function() { console.log(p); console.log(p2); console.log(p3); }); // logs // promise { <state>: "fulfilled", <value>: array[3] } // promise { <state>: "fulfilled", <value>: array[4] } // promise { <state>: "rejected", <reason>: 555 } asynchronicity or synchronicity of promise.all this following example demonstrates the asynchronicity (or synchronicity, if the i...
...terable passed is empty) of promise.all: // we are passing as argument an array of promises that are already resolved, // to trigger promise.all as soon as possible var resolvedpromisesarray = [promise.resolve(33), promise.resolve(44)]; var p = promise.all(resolvedpromisesarray); // immediately logging the value of p console.log(p); // using settimeout we can execute code after the stack is empty settimeout(function() { console.log('the stack is now empty'); console.log(p); }); // logs, in order: // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: array[2] } the same thing happens if promise.all rejects: var mixedpromisesarray = [promise.resolve(33), promise.reject(44)]; var p = promise.all(mixedpromisesarray); console.log(p); s...
...ettimeout(function() { console.log('the stack is now empty'); console.log(p); }); // logs // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "rejected", <reason>: 44 } but, promise.all resolves synchronously if and only if the iterable passed is empty: var p = promise.all([]); // will be immediately resolved var p2 = promise.all([1337, "hi"]); // non-promise values will be ignored, but the evaluation will be done asynchronously console.log(p); console.log(p2) settimeout(function() { console.log('the stack is now empty'); console.log(p2); }); // logs // promise { <state>: "fulfilled", <value>: array[0] } // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: array[2] } promise.all fail-fast beh...

MathML attribute reference - MathML
align <mtable> <munder>, <mover>, <munderover> <mstack> specifies different alignments of several elements (see element pages for details).
... unimplemented charalign <mstack> specifies the horizontal alignment of digits.
... unimplemented decimalpoint <mstyle> if the decimalpoint value is used to specify the alignment, this attribute is specifying the character for the alignment point within <mstack> and <mtable> columns.
... unimplemented stackalign <mstack> stretchy <mo> specifies whether the operator stretches to the size of the adjacent element.

Chapter 6: Firefox extensions and XUL applications - Archive of obsolete content
it.assertions; var tc = new testcase('rpn calc testcase'); var module = new modulemanager(); var rpncalc = module.require('package', 'calc'); tc.tests = { '2 1 +': function() { var calc = new rpncalc.rpncalc(); calc.init(); calc.push(2); calc.push(1); calc.plus(); assert.equals(calc.pop(), 3); } } listing 3: additional content for calc.js function rpncalc() { this.stack = new array(); } rpncalc.prototype = { init: function() { this.stack = new array(); }, push: function(val) { this.stack.push(number(val)); }, _letfunc: function(func) { a = this.pop(); b = this.pop(); this.push(func(a, b)); }, plus: function() { return this._letfunc(this._plus); }, _plus: function(a, b) { return a + b; }, pop: function() { ret...
...urn this.stack.pop(); } } check for errors now you’re ready for your first test.
...what if you attempt to run with nothing in the stack—what result will you return then?

Porting NSPR to Unix Platforms - Archive of obsolete content
in particular, you need to figure out which element in the <tt>jmp_buf</tt> is the stack pointer.
... usually <tt>jmp_buf</tt> is an array of integers, and some platforms have a <tt>jb_sp</tt> macro that tells you which array element is the stack pointer.
...i usually print out every element in the <tt>jmp_buf</tt> and see which one is the closest to the address of a local variable (local variables are allocated on the stack).

The new nsString class implementation (1999) - Archive of obsolete content
nsautostring we still offer an nsautostring that provides its own stack based buffer.
...an additional improvement has been made to nsautostring that allows it to use an arbitrarily sized stack based buffer rather than its own internal buffer.
... this means that you can continue to use efficient (temporary) stack buffers for string storage with the bonus of storage pools that serve your specific need.

Extentsions FAQ - Archive of obsolete content
"); var replaceme = document.getelementbyid("replaceme"); replaceme.parentnode.replacechild(newnode, replaceme); is it possible to place an image in the window that can be moved to anywhere in the window, and always remain on top of everything else?(similiar to using position:absolute and-index:100000 in html) you can almost do this with a stack: <window ...> <stack flex="1"> <image top="40" left="80"/> <vbox> other content here </vbox> </stack> </window> the only restriction is that your image can't overlap the right or bottom of the window.
... simply position the image and it will no longer be stretched to the size of the stack.
...there's a bug in bugzilla about stacking other widgets on top of browser/iframe, which hopefully will be fixed for gecko 1.9.

CSS - Archive of obsolete content
lications like firefox, the -moz-border-left-colors css property sets a list of colors for the left border.-moz-border-right-colorsin mozilla applications like firefox, the -moz-border-right-colors css property sets a list of colors for the right border.-moz-border-top-colorsin mozilla applications like firefox, the -moz-border-top-colors css property sets a list of colors for the top border.-moz-stack-sizing-moz-stack-sizing is an extended css property.
... normally, a <xul:stack> will change its size so that all of its child elements are completely visible.
... for example, moving a child of the stack far to the right will widen the stack so the child remains visible.-moz-text-blinkthe -moz-text-blink non-standard mozilla css extension specifies the blink mode.-moz-window-shadowthe -moz-window-shadow css property specifies whether a window will have a shadow.

Fundamental text and font styling - Learn web development
verdana sans-serif note: among various resources, the cssfontstack.com website maintains a list of web safe fonts available on windows and macos operating systems, which can help you make your decision about what you consider safe for your usage.
... my big red elephant font stacks since you can't guarantee the availability of the fonts you want to use on your webpages (even a web font could fail for some reason), you can supply a font stack so that the browser has multiple fonts it can choose from.
... it is a good idea to provide a suitable generic font name at the end of the stack so that if none of the listed fonts are available, the browser can at least provide something approximately suitable.

Web fonts - Learn web development
you can use the font stack to specify preferable fonts, followed by web-safe alternatives, followed by the default system font, but this adds overhead in terms of testing to make sure that your designs look ok with each font, etc.
... now you can use these fonts in your font stacks, just like any web safe or default system font.
...creating custom font stacks with unicode-range by drew mclellan provides some useful ideas on how to make use of this.

Cooperative asynchronous JavaScript: Timeouts and intervals - Learn web development
(in other words, when the stack is empty.) you will learn more on this matter as you progress through this article.
...the callbacks you pass to these functions cannot run until the stack on the main thread is empty.
... as a consequence, code like settimeout(fn, 0) will execute as soon as the stack is empty, not immediately.

Aprender y obtener ayuda - Learn web development
if other people have had the same problem, there'll likely be some articles or blog posts about it in places like mdn or stack overflow.
... note: stack overflow is a really useful website — it is basically a huge database of curated questions and answers on various technologies and related techniques.
... other online resources we already mentioned stack overflow, but there are other online resources that can help.

React interactivity: Editing, filtering, conditional rendering - Learn web development
copy this block of code into the todo() function, beneath your usestate() hook but above the return statement: const editingtemplate = ( <form classname="stack-small"> <div classname="form-group"> <label classname="todo-label" htmlfor={props.id}> new name for {props.name} </label> <input id={props.id} classname="todo-text" type="text" /> </div> <div classname="btn-group"> <button type="button" classname="btn todo-cancel"> cancel <span classname="visually-hidden">renaming {props.name}</span> ...
... </button> <button type="submit" classname="btn btn__primary todo-edit"> save <span classname="visually-hidden">new name for {props.name}</span> </button> </div> </form> ); const viewtemplate = ( <div classname="stack-small"> <div classname="c-cb"> <input id={props.id} type="checkbox" defaultchecked={props.completed} onchange={() => props.toggletaskcompleted(props.id)} /> <label classname="todo-label" htmlfor={props.id}> {props.name} </label> </div> <div classname="btn-group"> <button type="button" classname="btn"> edit <span classname="visually-hidden">{props.name}</span> </button> <button type="button" cla...
... bind this function to the form’s submit event by adding the following onsubmit handler to the editingtemplate's <form>: <form classname="stack-small" onsubmit={handlesubmit}> you should now be able to edit a task in your browser!

Dynamic behavior in Svelte: working with variables and props - Learn web development
replace your existing <ul> block with the following: <!-- todos --> <ul role="list" class="todo-list stack-large" aria-labelledby="list-heading"> {#each todos as todo (todo.id)} <li class="todo"> <div class="stack-small"> <div class="c-cb"> <input type="checkbox" id="todo-{todo.id}" checked={todo.completed}/> <label for="todo-{todo.id}" class="todo-label"> {todo.name} </label> </div> <div class="btn-group"> <button...
...update it like this: <div class="filters btn-group stack-exception"> <button class="btn toggle-btn" class:btn__primary={filter === 'all'} aria-pressed={filter === 'all'} on:click={()=> filter = 'all'} > <span class="visually-hidden">show</span> <span>all</span> <span class="visually-hidden">tasks</span> </button> <button class="btn toggle-btn" class:btn__primary={filter === 'active'} aria-pressed={filter === 'active'} on:click={()=> f...
... <ul role="list" class="todo-list stack-large" aria-labelledby="list-heading"> {#each filtertodos(filter, todos) as todo (todo.id)} ...

Vue conditional rendering: editing existing todos - Learn web development
copy the following code into that file: <template> <form class="stack-small" @submit.prevent="onsubmit"> <div> <label class="edit-label">edit name for &quot;{{label}}&quot;</label> <input :id="id" type="text" autocomplete="off" v-model.lazy.trim="newlabel" /> </div> <div class="btn-group"> <button type="button" class="btn" @click="oncancel"> cancel <span class="visually-hidden">editing {{label}}</span> </button> ...
... <template> <div class="stack-small"> <div class="custom-checkbox"> <input type="checkbox" class="checkbox" :id="id" :checked="isdone" @change="$emit('checkbox-changed')" /> <label :for="id" class="checkbox-label">{{label}}</label> </div> <div class="btn-group"> <button type="button" class="btn" @click="toggletoitemeditform"> edit <span class="visually-hidden">{{label}}</spa...
... first of all add v-if="!isediting" to the root <div> in your todoitem component, <div class="stack-small" v-if="!isediting"> next, below that <div>'s closing tag add the following line: <to-do-item-edit-form v-else :id="id" :label="label"></to-do-item-edit-form> we also need to import and register the todoitemeditform component, so we can use it inside this template.

Styling Vue components with CSS - Learn web development
font-size: 1.9rem; } [class*="__lg"]:not(:last-child) { margin-bottom: 1rem; } @media screen and (min-width: 620px) { [class*="__lg"] { font-size: 2.4rem; } } .visually-hidden { position: absolute; height: 1px; width: 1px; overflow: hidden; clip: rect(1px 1px 1px 1px); clip: rect(1px, 1px, 1px, 1px); clip-path: rect(1px, 1px, 1px, 1px); white-space: nowrap; } [class*="stack"] > * { margin-top: 0; margin-bottom: 0; } .stack-small > * + * { margin-top: 1.25rem; } .stack-large > * + * { margin-top: 2.5rem; } @media screen and (min-width: 550px) { .stack-small > * + * { margin-top: 1.4rem; } .stack-large > * + * { margin-top: 2.8rem; } } /* end global styles */ #app { background: #fff; margin: 2rem 0 4rem 0; padding: 1rem; padding-top: 0;...
... </label> </h2> <input type="text" id="new-todo-input" name="new-todo" autocomplete="off" v-model.lazy.trim="label" class="input__lg" /> <button type="submit" class="btn btn__primary btn__lg"> add </button> </form> </template> let's also add the stack-large class to the <ul> tag in our app.vue file.
... update it as follows: <ul aria-labelledby="list-summary" class="stack-large"> adding scoped styles the last component we want to style is our todoitem component.

Handling common JavaScript problems - Learn web development
the right-hand panel shows useful details pertaining to the current environment — breakpoints, callstack and currently active scopes.
... under call stack, you'll see a few entries — this is basically a list of the series of functions that were invoked to cause the current function to be invoked.
... exploring further down the call stack, click onload in the call stack section.

Benchmarking
async stacks async stacks no longer impact performance since firefox 78, as bug 1601179 limits async stack capturing to when devtools is opened.
... another option that is on by default in non-release builds is the preference javascript.options.asyncstack, which provides better debugging information to developers.
... profiling tools currently the gecko profiler has limitations in the ui for inverted call stack top function analysis which is very useful for finding heavy functions that call into a whole bunch of code.

Debugging on Windows
for example, to print curent javascript stack to stdout, evaluate this in quickwatch window: {,,xul}dumpjsstack() note: visual c++ will show you something in the quick watch window, but not the stack, you have to look in the os console for the output.
... also this magical command only works when the vc++ stack is in certain states.
... it works when you have js_interpret() in the newest stackframe debugging minidumps see debugging a minidump.

HTML parser threading
this method returns immediately if another invocation of it is already on the call stack (nested event loop case).
...the tree builder snapshot contains a copy of the tree builder stack, a copy of the list of open formatting elements and copies of various fields that define the tree builder state.
...(nshtml5treeopexecutor::runflushloop is on the call stack already in this case and will loop around to start flushing the ops right away.) if there's only one speculation or the speculation failed, it's necessary to bother the parser thread.

NSPR Poll Method
we consider a stack of nspr i/o layers on top of the network transport.
... in_flags [input argument] the in_flags argument specifies the events at the top layer of the i/o layer stack that the caller is interested in.
...however, pr_poll can only used with a stack whose bottom layer is nspr's reference implementation.

PR_CreateThread
syntax #include <prthread.h> prthread* pr_createthread( prthreadtype type, void (*start)(void *arg), void *arg, prthreadpriority priority, prthreadscope scope, prthreadstate state, pruint32 stacksize); parameters pr_createthread has the following parameters: type specifies that the thread is either a user thread (pr_user_thread) or a system thread (pr_system_thread).
... stacksize specifies your preference for the size of the stack, in bytes, associated with the newly created thread.
... if you pass zero in this parameter, pr_createthread chooses the most favorable machine-specific stack size.

GCIntegration - SpiderMonkey Redirect 1
stack roots to implement moving gc, we will remove the conservative stack scanner.
... brian hackett has written a dynamic analysis that uses the existing conservative stack scanner to find unrooted pointers to gc things on the stack and poisons them.
... heap pointers pointers to gc things from the heap must be treated differently because they don't have stack-like lifetimes.

Functions
an algol-like function may read the local variables and arguments of its immediate enclosing function from the stack, as if by magic.
... (jscontext::display caches the enclosing function's stack frame.) if that function is also algol-like, its child can read locals and variables from the next enclosing function, and so on.
...when a flat closure is created, all the closed-on values are copied from the stack into reserved slots of the function object.

SpiderMonkey Internals
a js-to-js function call pushes a javascript stack frame without growing the c stack.
... but since js-to-c-to-js call stacks are common, the interpreter is reentrant.
... jsinterp.*, jscntxt.*, jsinvoke.cpp the bytecode interpreter, and related functions such as call and allocstack, live in jsinterp.cpp.

JS::CreateError
syntax // added in spidermonkey 45 bool js::createerror(jscontext *cx, jsexntype type, handleobject stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); // obsolete since jsapi 39 bool js::createerror(jscontext *cx, jsexntype type, handlestring stack, handlestring filename, uint32_t linenumber, uint32_t columnnumber, jserrorreport *report, handlestring message, mutablehandlevalue rval); name type description cx jscontext * pointer to a js context from which to derive runtime information.
... stack js::handlestring or js::handleobject the value of error.prototype.stack.
... see also mxr id search for js::createerror jsexntype jserrorreport bug 984048 bug 1038238 -- change stack parameter from js::handlestring to js::handleobject ...

JSNative
this has limited use cases; it's used to implement firefox's "slow script" dialog, for example.) when a jsnative is called, no jsstackframe is generated.
... this causes the function not to appear on the stack in javascript debuggers.
... it also means that applications that implement jscheckaccessop or jscheckaccessidop in terms of apis such as js_frameiterator and js_stackframeprincipals, must take extra care, as the native function's principals will be missing from the stack.

JS_GetGCParameter
typedef enum jsgcparamkey { jsgc_max_bytes, jsgc_max_malloc_bytes, jsgc_max_nursery_bytes, jsgc_bytes, jsgc_number, jsgc_mode, jsgc_unused_chunks, jsgc_total_chunks, jsgc_slice_time_budget, jsgc_mark_stack_limit, jsgc_high_frequency_time_limit, jsgc_high_frequency_low_limit, jsgc_high_frequency_high_limit, jsgc_high_frequency_heap_growth_max, jsgc_high_frequency_heap_growth_min, jsgc_low_frequency_heap_growth, jsgc_dynamic_heap_growth, jsgc_dynamic_mark_slice, jsgc_allocation_threshold, jsgc_min_empty_chunk_count, jsgc_max_empty_chunk_count, jsgc_comp...
... jsgc_mark_stack_limit / "markstacklimit" maximum size the gc mark stack can grow to (units: entries).
...r js_setgcparameter bug 474801 jsgc_bytes jsgc_number bug 474497 jsgc_max_code_cache_bytes this option no-longer exists js_getgcparameterforthread js_setgcparameterforthread bug 624229 jsgc_mode bug 631733 jsgc_unused_chunks bug 674480 jsgc_total_chunks bug 641025 jsgc_slice_time_budget bug 673551 jsgc_mark_stack_limit bug 765435 jsgc_high_frequency_time_limit jsgc_high_frequency_low_limit jsgc_high_frequency_high_limit jsgc_high_frequency_heap_growth_max jsgc_high_frequency_heap_growth_min jsgc_low_frequency_heap_growth jsgc_dynamic_heap_growth jsgc_dynamic_mark_slice bug 800063 jsgc_allocation_threshold bug 871005 jsgc_decommit_threshold this o...

JS_PopArguments
frees the stack entry allocated by js_pusharguments.
... mark void * pointer to a void * which holds the stack frame pointer previously supplied by js_pusharguments.
... description js_poparguments frees the stack frame pointer previously allocated by js_pusharguments and unroots the jsvals which have been associated with it (those returned by js_pusharguments as well).

JS_PushArguments
on success, *markp receives the internally allocated stack mark which should be passed to js_poparguments.
...markp points to a void * to hold the internally allocated stack frame pointer to pass back to js_poparguments.
...the application must call js_poparguments using the supplied markp stack pointer when done with this stack frame, to free the memory and unroot the jsvals.

SpiderMonkey 1.8
the new function js_setscriptstackquota limits the size of the javascript stack.
... a new gc parameter, jsgc_stackpool_lifespan, controls how eagerly spidermonkey returns unused memory back to the system.
... countheap, dumpheap, gcparam, gczeal, and stackquota are related to memory management.

Detailed XPCOM hashtable guide
pldhashtables can be allocated on the stack or the heap: when allocated on the stack, or as a c++ class member, the table must be initialized using pl_dhashtableinit, and finalized using pl_dhashtablefinish; when allocated on the heap, use pl_newdhashtable and pl_dhashtabledestroy to allocate and delete the table.
... nsthashtables can be allocated on the stack, as class members, or on the heap.
...these classes can be used on the stack, as a class member, or on the heap.

Xptcall Porting Guide
these implementations use the basic strategy of: figure out how much stack space is needed for the params, make the space in a new frame, copy the params to that space, invoke the method, cleanup and return.
...however, the __stdcall requires the callee to clean up the stack, so it is imperative that the interface information scheme allow the code to determine the correct stack pointer fixup for return without fail, else the process will crash.
...i ended up with larger stubs than i would have preferred rather than battle the compiler over what would happen to the stack before my asm code began running.

Standard OS Libraries
gtk+ and qt are graphic frameworks, the graphic stack under unix is xorg (x11/x).
... gdk is a stack under gtk+.
...so des are a stack over wms.

Debugger.Object - Firefox Developer Tools
promiseallocationsite if the referent is a promise, this is the javascript execution stack captured at the time of the promise’s allocation.
... promiseresolutionsite if the referent is a promise, this is the javascript execution stack captured at the time of the promise’s resolution.
... allocationsite if object allocation site tracking was enabled when this debugger.object’s referent was allocated, return the javascript execution stack captured at the time of the allocation.

Migrating from Firebug - Firefox Developer Tools
examine call stack when the script execution is paused, firebug displays the function call stack within its stack side panel.
...in the devtools the function call stack is shown within the call stack side panel.
...with the script execution halted it shows the different variable scopes available within the current call stack frame.

Allocations - Firefox Developer Tools
in this way you can walk back up the call stack, and understand better the context for these allocations.
...at the top level, these are always the same, since the view presents "leaf" functions at the top level (that is, it presents an inverted view of the call stack).
... but if you start walking back up the call stack, you'll see the difference: here, 8904 samples were taken in signallater().

Call Tree - Firefox Developer Tools
it periodically samples the state of the javascript engine and records the stack for the code executing at the time.
...this comes from the captured stacks where this function is the leafmost function.
... using an inverted, aka bottom-up, call tree an inverted call tree reverses the order of all stacks, putting the leafmost function calls at the top.

console - Web APIs
methods console.assert() log a message and stack trace to console if the first argument is false.
... console.trace() outputs a stack trace.
... stack traces the console object also supports outputting a stack trace; this will show you the call path taken to reach the point at which you call console.trace().

History.state - Web APIs
the history.state property returns a value representing the state at the top of the history stack.
... syntax const currentstate = history.state value the state at the top of the history stack.
... // should be null because we haven't modified the history stack yet console.log(`history.state before pushstate: ${history.state}`); // now push something on the stack history.pushstate({name: 'example'}, "pushstate example", 'page3.html'); // now state has a value.

History - Web APIs
state read only returns an any value representing the state at the top of the history stack.
... pushstate() pushes the given data onto the session history stack with the specified title (and, if provided, url).
... replacestate() updates the most recent entry on the history stack to have the specified data, title, and, if provided, url.

font-variant-numeric - CSS: Cascading Style Sheets
ed-zero; font-variant-numeric: lining-nums; /* <numeric-figure-values> */ font-variant-numeric: oldstyle-nums; /* <numeric-figure-values> */ font-variant-numeric: proportional-nums; /* <numeric-spacing-values> */ font-variant-numeric: tabular-nums; /* <numeric-spacing-values> */ font-variant-numeric: diagonal-fractions; /* <numeric-fraction-values> */ font-variant-numeric: stacked-fractions; /* <numeric-fraction-values> */ font-variant-numeric: oldstyle-nums stacked-fractions; /* global values */ font-variant-numeric: inherit; font-variant-numeric: initial; font-variant-numeric: unset; this property can take one of two forms: either the keyword value normal or one or more of the other values listed below, space-separated, in any order.
... stacked-fractions activating the set of figures where the numerator and denominator are made smaller, stacked and separated by a horizontal line.
...first-letter and ::first-line.inheritedyescomputed valueas specifiedanimation typediscrete formal syntax normal | [ <numeric-figure-values> | <numeric-spacing-values> | <numeric-fraction-values> | ordinal | slashed-zero ]where <numeric-figure-values> = [ lining-nums | oldstyle-nums ]<numeric-spacing-values> = [ proportional-nums | tabular-nums ]<numeric-fraction-values> = [ diagonal-fractions | stacked-fractions ] examples setting ordinal numeric forms html <p class="ordinal">1st, 2nd, 3rd, 4th, 5th</p> css /* this example uses the source sans pro opentype font, developed by adobe and used here under the terms of the sil open font license, version 1.1: http://scripts.sil.org/cms/scripts/page.php?item_id=ofl_web */ @font-face { font-family: "source sans pro"; font-style: normal; f...

will-change - CSS: Cascading Style Sheets
be aware, that will-change may actually influence the visual appearance of elements, when used with property values, that create a stacking context (e.g.
... will-change: opacity), as the stacking context is created up front.
...chrome currently takes two actions, given particular css property idents: establish a new compositing layer or a new stacking context.

Function.caller - JavaScript
the special property __caller__, which returned the activation object of the caller thus allowing to reconstruct the stack, was removed for security reasons.
... notes note that in case of recursion, you can't reconstruct the call stack using this property.
... consider: function f(n) { g(n - 1); } function g(n) { if (n > 0) { f(n); } else { stop(); } } f(2); at the moment stop() is called the call stack will be: f(2) -> g(1) -> f(1) -> g(0) -> stop() the following is true: stop.caller === g && f.caller === g && g.caller === f so if you tried to get the stack trace in the stop() function like this: var f = stop; var stack = 'stack trace:'; while (f) { stack += '\n' + f.name; f = f.caller; } the loop would never stop.

Promise.race() - JavaScript
e demonstrates the asynchronicity of promise.race: // we are passing as argument an array of promises that are already resolved, // to trigger promise.race as soon as possible var resolvedpromisesarray = [promise.resolve(33), promise.resolve(44)]; var p = promise.race(resolvedpromisesarray); // immediately logging the value of p console.log(p); // using settimeout we can execute code after the stack is empty settimeout(function(){ console.log('the stack is now empty'); console.log(p); }); // logs, in order: // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: 33 } an empty iterable causes the returned promise to be forever pending: var foreverpendingpromise = promise.race([]); console.log(foreverpendingpromise); settimeout(functio...
...n(){ console.log('the stack is now empty'); console.log(foreverpendingpromise); }); // logs, in order: // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "pending" } if the iterable contains one or more non-promise value and/or an already settled promise, then promise.race will resolve to the first of these values found in the array: var foreverpendingpromise = promise.race([]); var alreadyfulfilledprom = promise.resolve(100); var arr = [foreverpendingpromise, alreadyfulfilledprom, "non-promise value"]; var arr2 = [foreverpendingpromise, "non-promise value", promise.resolve(100)]; var p = promise.race(arr); var p2 = promise.race(arr2); console.log(p); console.log(p2); settimeout(function(){ console.log('the stack is now empty'); console.log(p...
...); console.log(p2); }); // logs, in order: // promise { <state>: "pending" } // promise { <state>: "pending" } // the stack is now empty // promise { <state>: "fulfilled", <value>: 100 } // promise { <state>: "fulfilled", <value>: "non-promise value" } using promise.race – examples with settimeout var p1 = new promise(function(resolve, reject) { settimeout(() => resolve('one'), 500); }); var p2 = new promise(function(resolve, reject) { settimeout(() => resolve('two'), 100); }); promise.race([p1, p2]) .then(function(value) { console.log(value); // "two" // both fulfill, but p2 is faster }); var p3 = new promise(function(resolve, reject) { settimeout(() => resolve('three'), 100); }); var p4 = new promise(function(resolve, reject) { settimeout(() => reject(new error...

ReferenceError - JavaScript
referenceerror.prototype.stack stack trace.
...nedvariable } catch (e) { console.log(e instanceof referenceerror) // true console.log(e.message) // "undefinedvariable is not defined" console.log(e.name) // "referenceerror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 6 console.log(e.stack) // "@scratchpad/2:2:7\n" } creating a referenceerror try { throw new referenceerror('hello', 'somefile.js', 10) } catch (e) { console.log(e instanceof referenceerror) // true console.log(e.message) // "hello" console.log(e.name) // "referenceerror" console.log(e.filename) // "somefile.js" console.log(...
...e.linenumber) // 10 console.log(e.columnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'referenceerror' in that specification.

TypeError - JavaScript
typeerror.prototype.stack stack trace.
... examples catching a typeerror try { null.f() } catch (e) { console.log(e instanceof typeerror) // true console.log(e.message) // "null has no properties" console.log(e.name) // "typeerror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 2 console.log(e.stack) // "@scratchpad/2:2:3\n" } creating a typeerror try { throw new typeerror('hello', "somefile.js", 10) } catch (e) { console.log(e instanceof typeerror) // true console.log(e.message) // "hello" console.log(e.name) // "typeerror" console.log(e.filename) // "somefile.js" console.log(e.linenumber) // 10 console...
....log(e.columnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'typeerror' in that specification.

URIError - JavaScript
urierror.prototype.stack stack trace.
...examples catching an urierror try { decodeuricomponent('%') } catch (e) { console.log(e instanceof urierror) // true console.log(e.message) // "malformed uri sequence" console.log(e.name) // "urierror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 2 console.log(e.stack) // "@scratchpad/2:2:3\n" } creating an urierror try { throw new urierror('hello', 'somefile.js', 10) } catch (e) { console.log(e instanceof urierror) // true console.log(e.message) // "hello" console.log(e.name) // "urierror" console.log(e.filename) // "somefile.js" console.log(e.linenumber) // 10 console.log(e.c...
...olumnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'urierror' in that specification.

util/deprecate - Archive of obsolete content
globals functions deprecatefunction(fun, msg) dump to the console the error message given in the second argument, prefixed with "deprecated:", and print the stacktrace; then execute the function passed as first argument and returns its value.
... parameters fun : function the function to execute after the error message msg : string the error message to display returns * : the returned value from fun deprecateusage(msg) dump to the console the error message given, prefixed with "deprecated:", and print the stacktrace.

console - Archive of obsolete content
console.error(object[, object, ...]) logs the arguments to the console, preceded by "error:" and the name of your add-on: console.error("this is an error message"); error: my-addon: this is an error message console.exception(exception) logs the given exception instance as an error, outputting information about the exception's stack traceback if one is available.
... console.trace() logs a stack trace at the point the function is called.

JavaScript Debugger Service - Archive of obsolete content
ineno, colno, flags, errnum, exc) { // your function here } }; // triggered when jsd.errorhook[onerror] returns false jsd.debughook = { onexecute: function(frame, type, rv) { // your function here } }; jsd.enumeratescripts({ // the enumeratescript method will be called once for every script jsd knows about enumeratescript: function(script) { // your function here } }); a simple stack trace here, we will show how to implement a simple javascript stack trace using the jsd.
...rhook.report_strict) messagetype += "-strict"; dump(messagetype + "\n"); return false; // trigger debughook // return true; if you do not wish to trigger debughook } }; // note that debughook does not _always_ trigger when jsd.errorhook[onerror] returns false // it is not well-known why debughook sometimes fails to trigger jsd.debughook = { onexecute: function(frame, type, rv) { stacktrace = ""; for (var f = frame; f; f = f.callingframe) { stacktrace += f.script.filename + "@" + f.line + "@" + f.functionname + "\n"; } dump(stacktrace); return components.interfaces.jsdiexecutionhook.return_continue; } }; filters jsd also allows the use of filters to track which scripts should trigger the hooks.

Images, Tables, and Mysterious Gaps - Archive of obsolete content
unfortunately, the buttons in the top cell are all now block-level and so end up stacked on top of one another instead of being shown side-by-side.
...this would be especially true if there are many single-pixel cells intended to create cool stacked lines, or something like that.

Remote debugging - Archive of obsolete content
a good place to start is a detailed stack (in gdb, use bt followed by bt full).
... there give more information about the stack than a breakpad crash report: not only the names of the functions on the stack, but also the values they were passed.

String Quick Reference - Archive of obsolete content
note: may involve changing existing apis old way: wrap with nscautostring() // foo is a prunichar* string // call // void handlestring(const nsstring& str); handlestring(nsautostring(foo)); new way: wrap with nsdependentstring // foo is a prunichar* string // fix caller to be // void handlestring(const nsastring& str); handlestring(nsdependentstring(foo)); stack-based strings what: use of special stack-oriented classes why: to avoid excess heap allocations and memory leaks wrong: use nsstring/nscstring or raw characters // call getstringvalue(nsastring& out); nsstring value; getstringvalue(value); // call getstringvalue(char** out); char *result; getstringvalue(&result); // don't forget to free result!
... right: use nsautostring/nscautostring and nsxpidlstring/nsxpidlcstring // call getstringvalue(nsastring& out); nsautostring value; // 64-character buffer on stack getstringvalue(value); // call getstringvalue(char** out); nsxpidlcstring result; getstringvalue(getter_copies(result)); // result will free automatically original document information author: alec flett last updated date: april 30, 2003 copyright information: portions of this content are © 1998–2007 by individual mozilla.org contributors; content available under a creative commons license | details.

mousethrough - Archive of obsolete content
the mousethrough attribute is typically used in conjunction with a stack to allow elements to be stacked above other elements yet allow mouse events to be sent to lower elements.
... <stack> <button label="below"/> <image src="happy.png" mousethrough="always"/> </stack> ...

Using the Editor from XUL - Archive of obsolete content
nshtmleditor::inserttext() hides quite a bit of complexity in some stack-based classes.
... another stack-based class, nsautorules, ensures that text insertion is wrapped with calls to nshtmleditor::startoperation() / endoperation().

XUL element attributes - Archive of obsolete content
left type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the left edge of the element relative to the left edge of the stack.
... top type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the top edge of the element relative to the top edge of the stack.

XUL Reference - Archive of obsolete content
titem member menu menubar menuitem menulist menupopup menuseparator notification notificationbox observes overlay page panel param popupset preference preferences prefpane prefwindow progressmeter query queryset radio radiogroup resizer richlistbox richlistitem row rows rule scale script scrollbar scrollbox scrollcorner separator spacer spinbuttons splitter stack statusbar statusbarpanel stringbundle stringbundleset tab tabbrowser (firefox-only starting with firefox 3/gecko 1.9) tabbox tabpanel tabpanels tabs template textnode textbox textbox (firefox autocomplete) textbox (mozilla autocomplete) timepicker titlebar toolbar toolbarbutton toolbargrippy toolbaritem toolbarpalette toolbarseparator toolbarset toolbarspacer toolbarspri...
...cker datepicker menulist progressmeter radio radiogroup scale splitter textbox textbox (firefox autocomplete) textbox (mozilla autocomplete) timepicker description label image listbox listitem listcell listcol listcols listhead listheader richlistbox richlistitem tree treecell treechildren treecol treecols treeitem treerow treeseparator box hbox vbox bbox deck stack grid columns column rows row scrollbox action assign binding bindings conditions content member param query queryset rule template textnode triple where script commandset command broadcaster broadcasterset observes key keyset stringbundle stringbundleset arrowscrollbox dropmarker grippy scrollbar scrollcorner spinbuttons all attributes all properties all me...

resizer - Archive of obsolete content
ottom" height="2" style="background-color: grey; cursor: s-resize;"/> </vbox> <vbox width="2" style="background-color: grey; overflow: hidden;"> <resizer dir="topright" height="2" style="cursor: ne-resize;"/> <resizer dir="right" flex="1" style="cursor: e-resize;"/> <resizer dir="bottomright" height="2" style="cursor: se-resize;"/> </vbox> </hbox> </window> resizing an element <stack style="border: 1px solid black;"> <button id="button" label="resizable" left="18" top="18" right="18" bottom="18"/> <resizer dir="topleft" style="background: black; -moz-appearance: none;" element="button" left="0" top="0" width="16" height="16"/> <resizer dir="topright" style="background: black; -moz-appearance: none;" element="button" right="0" top="0" width="16" hei...
...ght="16"/> <resizer dir="bottomleft" style="background: black; -moz-appearance: none;" element="button" left="0" bottom="0" width="16" height="16"/> <resizer dir="bottomright" style="background: black; -moz-appearance: none;" element="button" right="0" bottom="0" width="16" height="16"/> </stack> attributes dir type: one of the values below the direction that the window is resized.

NPN_SetValue - Archive of obsolete content
wed/windowless mode for plugin display; true=windowed, false=windowless nppvplugintransparentbool: sets transparent mode for display of a plugin; true=transparent, false=opaque nppvjavaclass nppvpluginwindowsize nppvplugintimerinterval nppvpluginscriptableinstance nppvpluginscriptableiid nppvjavascriptpushcallerbool: specifies whether you are pushing or popping the jscontext off the stack nppvpluginkeeplibraryinmemory: tells browser that the plugin dll should live longer than usual nppvpluginneedsxembed nppvpluginscriptablenpobject nppvformvalue nppvplugindrawingmodel value the value of the specified variable to be set.
... nppvjavascriptpushcallerbool sets whether you are pushing or popping the appropriate jscontext off the stack (see the two-way scriptability article on the mozilla plugins project page for more details).

Common Firefox theme issues and solutions - Archive of obsolete content
ing css rules also need to be copied to the proper location in the browser.css file and modified as necessary: /* page proxy icon */ #page-proxy-favicon { width: 16px; height: 16px; margin: 1px 3px; list-style-image: url(chrome://browser/skin/identity-icons-generic.png); -moz-image-region: rect(0, 16px, 16px, 0); } .verifieddomain > #identity-box-inner > #page-proxy-stack > #page-proxy-favicon { list-style-image: url(chrome://browser/skin/identity-icons-https.png); } .verifiedidentity > #identity-box-inner > #page-proxy-stack > #page-proxy-favicon { list-style-image: url(chrome://browser/skin/identity-icons-https-ev.png); } #identity-box:hover > #identity-box-inner > #page-proxy-stack > #page-proxy-favicon { -moz-image-region: rect(0, 32px, 1...
...6px, 16px); } #identity-box:hover:active > #identity-box-inner > #page-proxy-stack > #page-proxy-favicon, #identity-box[open=true] > #identity-box-inner > #page-proxy-stack > #page-proxy-favicon { -moz-image-region: rect(0, 48px, 16px, 32px); } #page-proxy-favicon[pageproxystate="invalid"] { opacity: 0.5; } for more information about identity boxes please see the identity box section of the amo editors theme review guidelines no visual clue for disabled url bars there needs to be a visual clue when url bar is disabled.

Theme changes in Firefox 2 - Archive of obsolete content
on:active toolbar[iconsize="small"] #new-window-button:active toolbar[iconsize="small"] #paste-button:active toolbar[iconsize="small"] #print-button:active toolbar[iconsize="small"] #reload-button:active toolbar[iconsize="small"] #stop-button:active toolbar[mode="icons"] .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-1 > .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-1 > stack > toolbarbutton > .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-icon the following styles need to be added to your theme to be compatible with firefox 2: #back-button .toolbarbutton-menubutton-dropmarker #back-button:hover #back-button:hover .toolbarbutton-menubutton-dropmarker #back-button:hover:active #back-button:hover:active .toolbarbutton-menubutton-dropmarker #back-butt...
...tal"] .scrollbutton-down[orient="horizontal"][disabled="true"] .scrollbutton-up .scrollbutton-up > .toolbarbutton-text .scrollbutton-up[disabled="true"] .scrollbutton-up[orient="horizontal"] .scrollbutton-up[orient="horizontal"][disabled="true"] toolbar[mode="icons"] .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-1 > .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-1 > stack > toolbarbutton > .toolbarbutton-text toolbar[mode="text"] .toolbarbutton-icon you may wish to change other styles as well.

Debug - Archive of obsolete content
functions debug.mstraceasynccallbackcompleted indicates that the callback stack associated with a previously specified asynchronous operation has completed.
... debug.mstraceasynccallbackstarting associates the callback stack with a previously specified asynchronous operation.

Index - MDN Web Docs Glossary: Definitions of Web-related terms
62 call stack call stack, codingscripting, glossary, javascript a call stack is a mechanism for an interpreter (like the javascript interpreter in a web browser) to keep track of its place in a script that calls multiple functions — what function is currently being run and what functions are called from within that function, etc.
... 431 stacking context css, codingscripting, glossary stacking context refers to how elements on a webpage appear to sit on top of other elements, just as you can arrange index cards on your desk to lie side-by-side or overlap each other.

MDN Web Docs Glossary: Definitions of Web-related terms
bidi bigint blink block block (css) block (scripting) block cipher mode of operation boolean boot2gecko bootstrap bounding box breadcrumb brotli browser browsing context buffer c cache cacheable caldav call stack callback function canonical order canvas card sorting carddav caret cdn certificate authority certified challenge-response authentication character character encoding character set chrome cia cipher cipher suite ciphertext class...
... sisd site site map sld sloppy mode slug smoke test smpte (society of motion picture and television engineers) smtp snap positions soap spa (single-page application) specification speculative parsing speed index sql sql injection sri stacking context state machine statement static method static typing strict mode string stun style origin stylesheet svg svn symbol symmetric-key cryptography synchronous syntax syntax error synthetic monitoring t tag ...

Backgrounds and borders - Learn web development
the backgrounds will layer with the last listed background image at the bottom of the stack, and each previous image stacking on top of the one that follows it in the code.
...to demonstrate the stacking order, try switching which background image comes first in the list.

CSS FAQ - Learn web development
the z-index property specifies the stack order of elements.
... an element with a higher z-index/stack order is always rendered in front of an element with a lower z-index/stack order on the screen.

create fancy boxes - Learn web development
they are stacked on top of each other like layers.
...i want to be fancy.</div> okay, let's have fun with backgrounds: .fancy { padding : 1em; width: 100%; height: 200px; box-sizing: border-box; /* at the bottom of our background stack, let's have a misty grey solid color */ background-color: #e4e4d9; /* we stack linear gradients on top of each other to create our color strip effect.

What is a web server? - Learn web development
a static web server, or stack, consists of a computer (hardware) with an http server (software).
...this approach provides more flexibility, but the technical stack is more complex, making it dramatically more challenging to build a website.

What software do I need to build a website? - Learn web development
it's best to take advantage of services like browsershots or browserstack.
...browserstack actually gives you full remote access to virtual machines so you can test your site in the most common environments.

Handling common HTML and CSS problems - Learn web development
among the best sources of support information are the mozilla developer network (that's where you are now!), stackoverflow.com, and caniuse.com.
... stackoverflow.com (so) is a forum site where you can ask questions and have fellow developers share their solutions, look up previous posts, and help other developers.

Chrome Worker Modules
stack traces unfortunately, the module loader doesn’t play nicely with error stack traces.
... that is, the following will not show human-readable stacks: try { mymodule.foo(); } catch (ex) { log("exception raised at " + ex.filename) log("stack: " + ex.stack); } rather, you should use properties modulename and modulestack, as follows: try { mymodule.foo(); } catch (ex) { log("exception raised at " + ex.modulename) log("stack: " + ex.modulestack); } subtleties you shouldn’t mix both styles exports.foo = bar and module.exports = {foo: bar}.

Building SpiderMonkey with UBSan
when you hit a bug and want a stack trace, run under gdb with a breakpoint at the end of __ubsan::diag::~diag().
... the stack trace should show a function such as __ubsan_handle_load_invalid_value or __ubsan_handle_type_mismatch being called by the buggy c++ code.

Debugging JavaScript
in debug builds this also dumps a stack trace to the console, even when the debugger is not running.
... in extensions you can print the callstack using components.stack like this: function getstackdump() { var lines = []; for (var frame = components.stack; frame; frame = frame.caller) { lines.push(frame.filename + " (" + frame.linenumber + ")"); } return lines.join("\n"); } see also debugging mozilla with gdb setting up an extension development environment (particularly development preferences and development extensions) original document information author(s): ben bucksch created date: september 12, 2005, last updated date: november 10, 2009 copyright information: portions of this content are © 1998–2007 by individual mozilla.org contributors; content available under a creative commons license | details.

Debugging a hang on OS X (Archived)
when it's done parsing the data, click the "show text report" button; a new window will open with a couple of rows with stacktraces for all the threads in the sampled application.
... when it's done parsing the data, you should now have a couple of rows with stacktraces for all the threads in the sampled application.

IME handling guide
limitation of handling composition currently, editorbase touches undo stack at receiving every widgetcompositionevent.
...if we make editorbase not touch undo stack until composition is committed, some of the cases must be fixed.

Assert.jsm
arguments passed in to this function are: err an error object when the assertion failed or null when it passed message message describing the assertion stack stack trace of the assertion function.
...l the result of evaluating the assertion expected expected result from the test author message short explanation of the expected result operator operation qualifier used by the assertion method (ex: '==') examples custom reporter example components.utils.import("resource://testing-common/assert.jsm"); let assert = new assert(); assert.setreporter(function customreporter(err, message, stack) { if (err) { do_report_result(false, err.message, err.stack); } else { do_report_result(true, message, stack); } }); ...

Profiling with Instruments
memory profiling instruments will record a call stack at each allocation point.
...this malloc profiling is done using the malloc_logger infrastructure (similar to mallocstacklogging).

NSPR's Position On Abrupt Thread Termination
in the natural course of events, these resources will be allocated by a thread, used for some period of time, and then freed as the stack unwinds.
... in these cases, the presence of the data is recorded only on the stack, known only to the single thread (normally referred to as encapsulated).

PR_AttachThread
syntax #include <pprthread.h> prthread* pr_attachthread( prthreadtype type, prthreadpriority priority, prthreadstack *stack); parameters pr_attachthread has the following parameters: type specifies that the thread is either a user thread (pr_user_thread) or a system thread (pr_system_thread).
... stack the stack for the thread being attached.

PR_CreateThreadPool
syntax #include <prtpool.h> nspr_api(prthreadpool *) pr_createthreadpool( print32 initial_threads, print32 max_threads, pruint32 stacksize ); parameters the function has the following parameters: initial_threads the number of threads to be created within this thread pool.
... stacksize size of the stack allocated to each thread in the thread.

Self-hosted builtins in SpiderMonkey
debugging self-hosted code self-hosted code by default is hidden from client javascript code; in particular, self-hosted frames will be filtered out of the stack traces of exceptions.
... to include self-hosted frames in stack traces (in debug builds only), set the environment variable moz_show_all_js_frames.

JS_AddArgumentFormatter
for a given format string, for example "aa", the formatter is called from js_convertargumentsva like so: formatter(cx, "aa...", js_true, &sp, &ap); sp points into the arguments array on the js stack, while ap points into the stdarg.h va_list on the c stack.
... the js_true passed for fromjs tells the formatter to convert zero or more jsvals at sp to zero or more c values accessed via pointers-to-values at ap, updating both sp (via *vpp) and ap (via *app) to point past the converted arguments and their result pointers on the c stack.

JS_SaveFrameChain
description these two functions are used to set aside cx's call stack while that stack is inactive.
...before calling js_restoreframechain, cx's call stack must be balanced and all nested calls to js_saveframechain must have had matching js_restoreframechain calls.

JS_SetFunctionCallback
the call stack cannot be relied upon, because this callback may be invoked from the jit code when the stack frame and context are in an indeterminate state.
... note that debuggers should probably use js_setcallhook in preference to this function, because it is invoked when the javascript stack is guaranteed to be in a consistent state (and therefore it is valid to inspect and modify local variables, generate stack traces, and set breakpoints.) callback syntax typedef void (* jsfunctioncallback)(const jsfunction *fun,const jsscript *scr, const jscontext *cx, int entering); name type description fun const jsfunction * the javascript function being invoked or exited.

JSAPI reference
runtimes and contexts js_init added in spidermonkey 31 js_shutdown struct jsruntime js_newruntimeobsolete since jsapi 52 js_destroyruntime js_getruntimeprivate js_setruntimeprivate js_setnativestackquota added in spidermonkey 17 js_contextiteratorobsolete since jsapi 52 js_finish obsolete since jsapi 19 struct jscontext js_newcontext js_destroycontext js_destroycontextnogc js_setcontextcallback enum jscontextop js_getruntime js_getparentruntime added in spidermonkey 31 js_getobjectruntime added in spidermonkey 17 js_getcontextprivate js_setcontextprivate j...
... 30 js_getoperationcallback obsolete since jsapi 30 js_triggeroperationcallback obsolete since jsapi 30 js_clearoperationcallback obsolete since javascript 1.9.1 js_getoperationlimit obsolete since javascript 1.9.1 js_setoperationlimit obsolete since javascript 1.9.1 js_max_operation_limit obsolete since javascript 1.9.1 js_operation_weight_base obsolete since javascript 1.9.1 js_setthreadstacklimit obsolete since jsapi 13 js_setscriptstackquota obsolete since javascript 1.8.6 js_setoptions obsolete since jsapi 27 js_getoptions obsolete since jsapi 27 js_toggleoptions obsolete since jsapi 27 enum jsversion jsversion_ecma_3 jsversion_1_6 jsversion_1_7 jsversion_1_8 jsversion_ecma_5 jsversion_default jsversion_unknown jsversion_latest js_getimp...

JSDBGAPI
breakpoints js_settrap js_gettrapopcode js_cleartrap js_clearscripttraps js_clearalltraps js_handletrap js_setinterrupt js_clearinterrupt watchpoints js_setwatchpoint js_clearwatchpoint js_clearwatchpointsforobject js_clearallwatchpoints inspecting the stack js_pctolinenumber js_linenumbertopc js_getfunctionscript js_getfunctionnative js_getfunctionfastnative js_getscriptprincipals typedef jsstackframe js_frameiterator js_getframescript js_getframepc js_getscriptedcaller js_stackframeprincipals js_evalframeprincipals js_getframeannotation js_setframeannotation js_getframeprincipalarray js_isnativeframe js_getframeobject js_getframescopechain js_getframecallobjec...
...isconstructorframe js_isdebuggerframe js_getframereturnvalue js_setframereturnvalue js_getframecalleeobject js_getscriptfilename js_getscriptbaselinenumber js_getscriptlineextent js_getscriptversion js_gettopscriptfilenameflags js_getscriptfilenameflags js_flagscriptfilenameprefix jsfilename_null jsfilename_system jsfilename_protected evaluating debug code js_evaluateinstackframe examining object properties typedef jspropertydesc jspd_enumerate jspd_readonly jspd_permanent jspd_alias jspd_argument jspd_variable jspd_exception jspd_error typedef jspropertydescarray js_propertyiterator js_getpropertydesc js_getpropertydescarray js_putpropertydescarray hooks js_setdebuggerhandler js_setsourcehandler js_setexecutehook js_setcallhook js...

SpiderMonkey 17
js_isscriptframe jsclass_new_resolve_gets_start flag js_newnumbervalue js_finalizestub js_clearnewbornroots jsclass_mark_is_trace flag js_setscriptstackquota api changes break out and discuss all api changes here...
...exact stack rooting is requirement for a (moving) generational garbage collector.

Secure Development Guidelines
introduction provide developers with information on specific security issues cover common coding mistakes and how they affect a product how to avoid making them how to mitigate them everything is oriented toward c/c++ introduction: gaining control specifics about the underlying architecture, using x86 as an example 6 basic registers (eax, ebx, ecx, edx, edi, esi) 2 stack-related registers (esp, ebp) mark top and bottom of current stack frame status register (eflags) contains various state information instruction pointer (eip) points to register being executed; can’t be modified directly introduction: gaining control (2) eip is modified using call or jump instructions attacks usually rely on obtaining control over the eip...
... bbv: stack overflow example: void foo(char *bar) { char c[12]; strcpy(c, bar); } int main(int argc, char **argv) { foo(argv[1]); } bbv: stack overflow before the stack overflow bbv: stack overflow after the stack overflow bbv: heap overflow dynamic memory malloc() calloc() heapalloc() mmap() not on the stack segment!

Avoiding leaks in JavaScript XPCOM components
basics of memory management creating objects that are not a fixed size for the lifetime of the program (global variables) or a fixed size for the lifetime of a function (stack variables) requires a system for dynamic memory allocation: a system that allocates memory from a space called the heap.
...the roots include things like global variables and variables on the current call stack.

Using components
var { cu: utils, ci: interfaces, cc: classes, cr: results, cs: stack, cm: manager, ce: exception, } = components; here is a full breakdown of what is contained in components.
...] interfaces=[object nsxpccomponents_interfaces] classes=[object nsxpccomponents_classes] results=[object nsxpccomponents_results] issuccesscode=function issuccesscode() { [native code] } constructor=[object nsxpccomponents_constructor] queryinterface=function queryinterface() { [native code] } interfacesbyid=[object nsxpccomponents_interfacesbyid] classesbyid=[object nsxpccomponents_classesbyid] stack=js frame :: scratchpad/4 :: cdump :: line 8 manager=[xpconnect wrapped nsicomponentmanager] id=[object nsxpccomponents_id] exception=[object nsxpccomponents_exception] reporterror=function reporterror() { [native code] } cancreatewrapper=function cancreatewrapper() { [native code] } cancallmethod=function cancallmethod() { [native code] } cangetproperty=function cangetproperty() { [native code] }...

nsIAlertsService
rt(services.wm.getmostrecentwindow('navigator:firefox'), 'focus firefox', 'will now focus fireox and then focus the tab'); } else if (atopic == 'alertshow') { console.log('just showed notification'); } else if (atopic == 'alertfinished') { console.log('just alertfinished') } } }; as.showalertnotification('chrome://branding/content/icon64.png', 'stackoverflow - new messages', 'there are ## new messages.
... click here to focus the tab', true, null, notiflistener, 'stackoverflow notifier'); closealert() closes alerts created by the service.

nsIException
for example, standard language errors would generally have the same location as their top stack entry.
... location nsistackframe a stack trace, if available.

nsISupports proxies
as soon as the calling function or method exits, there is no guarantee about the data at the location that used to be part of that stack frame.
...stack frame goes away ...

nsIThreadObserver
recursiondepth the number of calls to nsithread.processnextevent() on the call stack in addition to the current call.
... recursiondepth the number of calls to nsithread.processnextevent() on the call stack in addition to the current call.

nsITransaction
the transaction manager calls this method to coalesce a new transaction with the transaction on the top of the undo stack.
...if true, the transaction manager will release() the new transaction instead of pushing it on the undo stack.

XPCOM Interface Reference
siblehyperlinkiaccessiblehypertextiaccessibleimageiaccessiblerelationiaccessibletableiaccessibletable2iaccessibletablecelliaccessibletextiaccessiblevalueidispatchijsdebuggeramiinstallcallbackamiinstalltriggeramiwebinstallinfoamiwebinstalllisteneramiwebinstallpromptamiwebinstallerimgicacheimgicontainerimgicontainerobserverimgidecoderimgidecoderobserverimgiencoderimgiloaderimgirequestinidomutilsjsdistackframemoziasyncfaviconsmoziasynchistorymozicoloranalyzermozijssubscriptloadermozipersonaldictionarymoziplaceinfomoziplacesautocompletemoziregistrymozirepresentativecolorcallbackmozispellcheckingenginemozistorageaggregatefunctionmozistorageasyncstatementmozistoragebindingparamsmozistoragebindingparamsarraymozistoragecompletioncallbackmozistorageconnectionmozistorageerrormozistoragefunctionmozistorag...
...nentnsiseekablestreamnsiselectionnsiselection2nsiselection3nsiselectioncontrollernsiselectionimageservicensiselectionprivatensiserversocketnsiserversocketlistenernsiservicemanagernsisessionstartupnsisessionstorensisimpleenumeratornsismsdatabaseservicensismsrequestmanagernsismsservicensisocketprovidernsisocketproviderservicensisockettransportnsisockettransportservicensisoundnsispeculativeconnectnsistackframensistandardurlnsistreamconverternsistreamlistenernsistringbundlensistringbundleoverridensistringbundleservicensistringenumeratornsistructuredclonecontainernsistylesheetservicensisupportsnsisupports proxiesnsisupportsarraynsisupportscstringnsisupportscharnsisupportsdoublensisupportsfloatnsisupportsidnsisupportsinterfacepointernsisupportsprboolnsisupportsprint16nsisupportsprint32nsisupportsprin...

Main Windows
two are stacked showing either a brief or expanded view of the headers.
...two are stacked showing either a brief or expanded view of the headers.

Using Objective-C from js-ctypes
objc_msgsend_stret for the method which returns structs on the stack.
... objc_msgsend_fpret / objc_msgsend_fp2ret for the method which returns floating-point values on the stack.

ctypes
credit for this example is to nmaier (stackoverflow :: getting tb_button is crashing and not working) example of cast and functiontype on windows components.utils.import("resource://gre/modules/ctypes.jsm"); var kernel = ctypes.open("kernel32.dll"); var hmodule = ctypes.uint32_t; var hwnd = ctypes.uint32_t; var lpctstr = ctypes.jschar.ptr; var lpcstr = ctypes.char.ptr; var loadlibrary = kernel.declare("loadlibraryw", ctypes.winapi_abi, ...
...adlibrary("user32"); var funcptr = getprocaddress(huser, "messageboxw"); // now we have a pointer to a function, let's cast it to the right type var messageboxtype = ctypes.functiontype(ctypes.winapi_abi, ctypes.int32_t, [hwnd, lpctstr, lpctstr, ctypes.uint32_t]); funcptr = ctypes.cast(funcptr, messageboxtype.ptr); funcptr(0, "test1", "test2", 0); credit for this example is to wladimir palant (stackoverflow :: how to call a function using pointer in js-ctypes) ...

Ignore a source - Firefox Developer Tools
however, a library’s abstraction leaks during debugging sessions when you are forced to step through its stack frames in order to reach your own code.
... when “pause on exceptions” is enabled in the debugger settings, the debugger won’t pause when an exception is thrown in the ignored source; instead it waits until (and if) the stack unwinds to a frame in a source that isn’t ignored.

Set an XHR breakpoint - Firefox Developer Tools
when your code breaks on an xhr request, the righthand pane will have two additional sections: call stack the list of functions that were executed in order ot get to the currently executing code.
... click on an item in the call stack to jump to the associated line in the code display.

Basic operations - Firefox Developer Tools
recording call stacks the memory tool can tell you exactly where in your code you are allocating memory.
...to do this, check "record call stacks" (before firefox 49 this was labeled "record allocation stacks"): ...

Memory - Firefox Developer Tools
the basics opening the memory tool taking a heap snapshot comparing two snapshots deleting snapshots saving and loading snapshots recording call stacks analyzing snapshots the tree map view is new in firefox 48, and the dominators view is new in firefox 46.
... if you've opted to record allocation stacks for the snapshot, the aggregate and dominators views can show you exactly where in your code allocations are happening.

Network request details - Firefox Developer Tools
the tabs at the top of this pane enable you to switch between the following pages: headers messages (only for websocket items) cookies params response cache timings security (only for secure pages) stack trace (only when the request has a stack trace, e.g.
...currently it warns you about two weaknesses: using sslv3 instead of tls using the rc4 cipher stack trace tab stack traces are shown in the stack trace tab, for responses that have a stack trace of course.

Edit fonts - Firefox Developer Tools
if you hover over the font-family property in the rules view, a tooltip shows a sample of the font: you'll also notice in the above screenshot that the font in the font-family font stack that is actually applied to the inspected element is underlined.
... this makes it easy to see exactly what is being applied where, when font stacks are specified.

Intensive JavaScript - Firefox Developer Tools
by switching to the flame chart view we can find out: this shows us the js call stack at this point in the execution.
... at the top of the stack is a function called calculateprimes(), and we can see its filename and line number.

UI Tour - Firefox Developer Tools
it periodically samples the state of the javascript engine, and records the stack for the code executing at the time the sample was taken.
... flame chart if the call tree tells you, statistically, which functions your site is spending most time executing across the whole recording, the flame chart tells you the call stack at any given point during the recording: to learn much more about the flame chart, see the separate flame chart page.

Console messages - Firefox Developer Tools
async stack frames stack traces show stack frames for async functions separately from those for synchronous functions.
... the web console supports the following console api messages: assert() clear() count() dir() dirxml() error() exception() group() groupend() info() log() table() time() timeend() trace() warn() the console prints a stack trace for all error messages, like this: function foo() { console.error("it explodes"); } function bar() { foo(); } function dostuff() { bar(); } dostuff(); server server-side log messages was introduced in firefox 43, but removed in firefox 56.

CanvasRenderingContext2D.save() - Web APIs
the canvasrenderingcontext2d.save() method of the canvas 2d api saves the entire state of the canvas by pushing the current state onto a stack.
... the drawing state the drawing state that gets saved onto a stack consists of: the current transformation matrix.

CanvasRenderingContext2D - Web APIs
the following methods help you to work with that state: canvasrenderingcontext2d.save() saves the current drawing style state using a stack so you can revert any change you make to it using restore().
... canvasrenderingcontext2d.restore() restores the drawing style state to the last element on the 'state stack' saved by save().

console.trace() - Web APIs
the console interface's trace() method outputs a stack trace to the web console.
... see stack traces in the console documentation for details and examples.

Using microtasks in JavaScript with queueMicrotask() - Web APIs
a microtask is a short function which is executed after the function or program which created it exits and only if the javascript execution stack is empty, but before returning control to the event loop being used by the user agent to drive the script's execution environment.
...the dowork() function here calls queuemicrotask(), yet the microtask still doesn't fire until the entire program exits, since that's when the task exits and there's nothing else on the execution stack.

History API - Web APIs
it exposes useful methods and properties that let you navigate back and forth through the user's history, and manipulate the contents of the history stack.
... another use for the go() method is to refresh the current page by either passing 0, or by invoking it without an argument: // the following statements // both have the effect of // refreshing the page window.history.go(0) window.history.go() you can determine the number of pages in the history stack by looking at the value of the length property: let numberofentries = window.history.length interfaces history allows manipulation of the browser session history (that is, the pages visited in the tab or frame that the current page is loaded in).

Introduction to the Real-time Transport Protocol (RTP) - Web APIs
those conditions may be affected by everything from the underlying layers of the network stack to the physical network connection, the intervening networks, the performance of the remote endpoint, noise levels, traffic levels, and so forth.
...instead, it only offers the information necessary to allow qos to be implemented elsewhere in the stack.

Basic Concepts of grid layout - CSS: Cascading Style Sheets
controlling the order we can control the order in which items stack up by using the z-index property - just like positioned items.
... if we give box2 a lower z-index than box1 it will display below box1 in the stack.

Recipe: Media objects - CSS: Cascading Style Sheets
requirements media object pattern needs some or all of the following characteristics: stacked on mobile, two columns on desktop.
...i define my grid once we have a max-width of 500 pixels, so on smaller devices the media object stacks.

Mozilla CSS extensions - CSS: Cascading Style Sheets
x-orient -moz-box-pack c–i -moz-context-properties -moz-float-edge -moz-force-broken-image-icon -moz-image-region o -moz-orient -moz-osx-font-smoothing -moz-outline-radius -moz-outline-radius-bottomleft -moz-outline-radius-bottomright -moz-outline-radius-topleft -moz-outline-radius-topright overflow-clip-box overflow-clip-box-block overflow-clip-box-inline s–z -moz-stack-sizing :-moz-system-metric(images-in-menus) :-moz-system-metric(mac-graphite-theme) :-moz-system-metric(scrollbar-end-backward) :-moz-system-metric(scrollbar-end-forward) :-moz-system-metric(scrollbar-start-backward) :-moz-system-metric(scrollbar-start-forward) :-moz-system-metric(scrollbar-thumb-proportional) :-moz-system-metric(touch-enabled) :-moz-system-metric(windows...
...t -moz-mac-accentregularshadow -moz-mac-chrome-active -moz-mac-chrome-inactive -moz-mac-focusring -moz-mac-menuselect -moz-mac-menushadow -moz-mac-menutextselect -moz-menuhover -moz-menuhovertext -moz-win-communicationstext -moz-win-mediatext -moz-nativehyperlinktext display -moz-box -moz-inline-block -moz-inline-box -moz-inline-gridobsolete since gecko 62 -moz-inline-stackobsolete since gecko 62 -moz-inline-table -moz-gridobsolete since gecko 62 -moz-grid-groupobsolete since gecko 62 -moz-grid-lineobsolete since gecko 62 -moz-groupbox -moz-deckobsolete since gecko 62 -moz-popupobsolete since gecko 62 -moz-stackobsolete since gecko 62 -moz-markerobsolete since gecko 62 empty-cells -moz-show-background (default value in quirks mode) font -mo...

box-decoration-break - CSS: Cascading Style Sheets
note that if you stack the rendering of the two fragments horizontally next to each other it will result in the non-fragmented rendering.
... block box fragments a block element with similar styles as above and no fragmentation results in: fragmenting the above block into three columns results in: note that stacking these pieces vertically will result in the non-fragmented rendering.

font-variant - CSS: Cascading Style Sheets
the possible values are: lining-nums, oldstyle-nums, proportional-nums, tabular-nums, diagonal-fractions, stacked-fractions, ordinal, and slashed-zero.
...> = [ discretionary-ligatures | no-discretionary-ligatures ]<historical-lig-values> = [ historical-ligatures | no-historical-ligatures ]<contextual-alt-values> = [ contextual | no-contextual ]<feature-value-name> = <custom-ident><numeric-figure-values> = [ lining-nums | oldstyle-nums ]<numeric-spacing-values> = [ proportional-nums | tabular-nums ]<numeric-fraction-values> = [ diagonal-fractions | stacked-fractions ]<east-asian-variant-values> = [ jis78 | jis83 | jis90 | jis04 | simplified | traditional ]<east-asian-width-values> = [ full-width | proportional-width ] examples setting the small-caps font variant html <p class="normal">firefox rocks!</p> <p class="small">firefox rocks!</p> css p.normal { font-variant: normal; } p.small { font-variant: small-caps; } result specifica...

perspective - CSS: Cascading Style Sheets
using this property with a value different than 0 and none creates a new stacking context.
... formal definition initial valuenoneapplies totransformable elementsinheritednocomputed valuethe absolute length or noneanimation typea lengthcreates stacking contextyes formal syntax none | <length> examples setting perspective this example shows a cube with the perspective set at different positions.

transform - CSS: Cascading Style Sheets
if the property has a value different than none, a stacking context will be created.
... find out more: mdn understanding wcag, guideline 2.3 explanations understanding success criterion 2.3.3 | w3c understanding wcag 2.1 formal definition initial valuenoneapplies totransformable elementsinheritednopercentagesrefer to the size of bounding boxcomputed valueas specified, but with relative lengths converted into absolute lengthsanimation typea transformcreates stacking contextyes formal syntax none | <transform-list>where <transform-list> = <transform-function>+where <transform-function> = <matrix()> | <translate()> | <translatex()> | <translatey()> | <scale()> | <scalex()> | <scaley()> | <rotate()> | <skew()> | <skewx()> | <skewy()> | <matrix3d()> | <translate3d()> | <translatez()> | <scale3d()> | <scalez()> | <rotate3d()> | <rotatex()> | <rotatey()> | <r...

translate - CSS: Cascading Style Sheets
formal definition initial valuenoneapplies totransformable elementsinheritednopercentagesrefer to the size of bounding boxcomputed valueas specified, but with relative lengths converted into absolute lengthsanimation typea transformcreates stacking contextyes formal syntax none | <length-percentage> [ <length-percentage> <length>?
... initial valuenoneapplies totransformable elementsinheritednopercentagesrefer to the size of bounding boxcomputed valueas specified, but with relative lengths converted into absolute lengthsanimation typea transformcreates stacking contextyes ...

InternalError: too much recursion - JavaScript
the javascript exception "too much recursion" or "maximum call stack size exceeded" occurs when there are too many function calls, or a function is missing a base case.
... message error: out of stack space (edge) internalerror: too much recursion (firefox) rangeerror: maximum call stack size exceeded (chrome) error type internalerror.

arguments.callee - JavaScript
(adapted from a stack overflow answer by olliej) early versions of javascript did not allow named function expressions, and for this reason you could not make a recursive function expression.
...well, at any point in time you can find the deepest caller of any function on the stack, and as i said above looking at the call stack has one single major effect: it makes a large number of optimizations impossible, or much much more difficult.

Functions - JavaScript
one can define "named" function expressions (where the name of the expression might be used in the call stack for example) or "anonymous" function expressions.
... is an example of an anonymous function expression (the name is not used): var myfunction = function() { statements } it is also possible to provide a name inside the definition in order to create a named function expression: var myfunction = function namedfunction(){ statements } one of the benefits of creating a named function expression is that in case we encountered an error, the stack trace will contain the name of the function, making it easier to find the origin of the error.

Array.prototype.flat() - JavaScript
flatdeep(val, d - 1) : val), []) : arr.slice(); }; flatdeep(arr, infinity); // [1, 2, 3, 4, 5, 6] use a stack // non recursive flatten deep using a stack // note that depth control is hard/inefficient as we will need to tag each value with its own depth // also possible w/o reversing on shift/unshift, but array ops on the end tends to be faster function flatten(input) { const stack = [...input]; const res = []; while(stack.length) { // pop value from stack const next = stack.pop(); if(...
...array.isarray(next)) { // push back array items, won't modify the original input stack.push(...next); } else { res.push(next); } } // reverse to restore input order return res.reverse(); } const arr = [1, 2, [3, 4, [5, 6]]]; flatten(arr); // [1, 2, 3, 4, 5, 6] use generator function function* flatten(array, depth) { if(depth === undefined) { depth = 1; } for(const item of array) { if(array.isarray(item) && depth > 0) { yield* flatten(item, depth - 1); } else { yield item; } } } const arr = [1, 2, [3, 4, [5, 6]]]; const flattened = [...flatten(arr, infinity)]; // [1, 2, 3, 4, 5, 6] please do not add polyfills on this article.

EvalError - JavaScript
evalerror.prototype.stack stack trace.
...ng an evalerror try { throw new evalerror('hello', 'somefile.js', 10); } catch (e) { console.log(e instanceof evalerror); // true console.log(e.message); // "hello" console.log(e.name); // "evalerror" console.log(e.filename); // "somefile.js" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'evalerror' in that specification.

Promise.prototype.then() - JavaScript
// using a resolved promise, the 'then' block will be triggered instantly, // but its handlers will be triggered asynchronously as demonstrated by the console.logs const resolvedprom = promise.resolve(33); let thenprom = resolvedprom.then(value => { console.log("this gets called after the end of the main stack.
... the value received and returned is: " + value); return value; }); // instantly logging the value of thenprom console.log(thenprom); // using settimeout we can postpone the execution of a function to the moment the stack is empty settimeout(() => { console.log(thenprom); }); // logs, in order: // promise {[[promisestatus]]: "pending", [[promisevalue]]: undefined} // "this gets called after the end of the main stack.

Promise - JavaScript
the promises of a chain are nested like russian dolls, but get popped like the top of a stack.
...therefore, an action for an already "settled" promise will occur only after the stack has cleared and a clock-tick has passed.

ReferenceError() constructor - JavaScript
nedvariable } catch (e) { console.log(e instanceof referenceerror) // true console.log(e.message) // "undefinedvariable is not defined" console.log(e.name) // "referenceerror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 6 console.log(e.stack) // "@scratchpad/2:2:7\n" } creating a referenceerror try { throw new referenceerror('hello', 'somefile.js', 10) } catch (e) { console.log(e instanceof referenceerror) // true console.log(e.message) // "hello" console.log(e.name) // "referenceerror" console.log(e.filename) // "somefile.js" console.log(...
...e.linenumber) // 10 console.log(e.columnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.

SyntaxError() constructor - JavaScript
ining the code that caused the exception linenumber optional the line number of the code that caused the exception examples catching a syntaxerror try { eval('hoo bar'); } catch (e) { console.error(e instanceof syntaxerror); console.error(e.message); console.error(e.name); console.error(e.filename); console.error(e.linenumber); console.error(e.columnnumber); console.error(e.stack); } creating a syntaxerror try { throw new syntaxerror('hello', 'somefile.js', 10); } catch (e) { console.error(e instanceof syntaxerror); // true console.error(e.message); // hello console.error(e.name); // syntaxerror console.error(e.filename); // somefile.js console.error(e.linenumber); // 10 console.error(e.columnnumb...
...er); // 0 console.error(e.stack); // @debugger eval code:3:9 } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.

SyntaxError - JavaScript
syntaxerror.prototype.stack stack trace.
... examples catching a syntaxerror try { eval('hoo bar'); } catch (e) { console.error(e instanceof syntaxerror); console.error(e.message); console.error(e.name); console.error(e.filename); console.error(e.linenumber); console.error(e.columnnumber); console.error(e.stack); } creating a syntaxerror try { throw new syntaxerror('hello', 'somefile.js', 10); } catch (e) { console.error(e instanceof syntaxerror); // true console.error(e.message); // hello console.error(e.name); // syntaxerror console.error(e.filename); // somefile.js console.error(e.linenumber); // 10 console.error(e.columnnumber); // 0 console.error(e.stack); // @debugger eval code:3:9 } s...

TypeError() constructor - JavaScript
ption examples catching a typeerror try { null.f() } catch (e) { console.log(e instanceof typeerror) // true console.log(e.message) // "null has no properties" console.log(e.name) // "typeerror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 2 console.log(e.stack) // "@scratchpad/2:2:3\n" } creating a typeerror try { throw new typeerror('hello', "somefile.js", 10) } catch (e) { console.log(e instanceof typeerror) // true console.log(e.message) // "hello" console.log(e.name) // "typeerror" console.log(e.filename) // "somefile.js" console.log(e.linenumber) // 10 console...
....log(e.columnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.

URIError() constructor - JavaScript
examples catching an urierror try { decodeuricomponent('%') } catch (e) { console.log(e instanceof urierror) // true console.log(e.message) // "malformed uri sequence" console.log(e.name) // "urierror" console.log(e.filename) // "scratchpad/1" console.log(e.linenumber) // 2 console.log(e.columnnumber) // 2 console.log(e.stack) // "@scratchpad/2:2:3\n" } creating an urierror try { throw new urierror('hello', 'somefile.js', 10) } catch (e) { console.log(e instanceof urierror) // true console.log(e.message) // "hello" console.log(e.name) // "urierror" console.log(e.filename) // "somefile.js" console.log(e.linenumber) // 10 console.log(e.c...
...olumnnumber) // 0 console.log(e.stack) // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.

WebAssembly.CompileError - JavaScript
webassembly.compileerror.prototype.stack stack trace.
... new webassembly.compileerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof compileerror); // true console.log(e.message); // "hello" console.log(e.name); // "compileerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

WebAssembly.LinkError - JavaScript
webassembly.linkerror.prototype.stack stack trace.
...{ throw new webassembly.linkerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof linkerror); // true console.log(e.message); // "hello" console.log(e.name); // "linkerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'linkerror' in that specification.

WebAssembly.RuntimeError - JavaScript
webassembly.runtimeerror.prototype.stack stack trace.
... new webassembly.runtimeerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof runtimeerror); // true console.log(e.message); // "hello" console.log(e.name); // "runtimeerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

JavaScript
stack overflow stack overflow questions tagged with "javascript".
... stackblitz stackblitz is another online playground/debugging tool, which can host and deploy full-stack applications using react, angular, etc.

<mstyle> - MathML
decimalpoint this attribute is specifying the character for the alignment point within <mstack> and <mtable> columns, if the decimalpoint value is used to specify the alignment.
... align does not apply to <mtable> or <mstack>.

MathML element reference - MathML
es) n <mn> (number) o <mo> (operator) <mover> (overscript) p <mpadded> (space around content) <mphantom> (invisible content with reserved space) r <mroot> (radical with specified index) <mrow> (grouped sub-expressions) s <ms> (string literal) <mscarries> (annotations such as carries) <mscarry> (single carry, child element of <mscarries>) <msgroup> (grouped rows of <mstack> and <mlongdiv> elements) <msline> (horizontal lines inside <mstack> elements) <mspace> (space) <msqrt> (square root without an index) <msrow> (rows in <mstack> elements) <mstack> (stacked alignment) <mstyle> (style change) <msub> (subscript) <msup> (superscript) <msubsup> (subscript-superscript pair) t <mtable> (table or matrix) <mtd> (cell in a table or a matrix) <mtext> (text) ...
...lose> <merror> <mfenced> <mfrac> <mpadded> <mphantom> <mroot> <mrow> <msqrt> <mstyle> script and limit elements <mmultiscripts> <mover> <mprescripts> <msub> <msubsup> <msup> <munder> <munderover> <none> tabular math <maligngroup> <malignmark> <mlabeledtr> <mtable> <mtd> <mtr> elementary math <mlongdiv> <mscarries> <mscarry> <msgroup> <msline> <msrow> <mstack> uncategorized elements <maction> semantic annotations <annotation> <annotation-xml> <semantics> ...

starts-with - XPath
syntax starts-with(haystack, needle) arguments haystack the string to look in.
... returns true if haystack starts with needle.

substring-after - XPath
syntax substring-after(haystack ,needle ) arguments haystack the string to be evaluated.
...everything after the first occurrence ofneedle inhaystack will be returned.

substring-before - XPath
syntax substring-before(haystack ,needle ) arguments haystack the string to be evaluated.
...everything before the first occurrence ofneedle inhaystack will be returned.

/loader - Archive of obsolete content
options.line: line number to start count from in stack traces.

core/promise - Archive of obsolete content
ndle) { if (error) return ui.displayerror(error); twitter.gettweetsfor(handle, funtion continuewith(error, tweets) { if (error) return ui.displayerror(error); ui.showtweets(tweets); }); }); }); doing things in parallel is even harder: var tweets, answers, checkins; twitter.gettweetsfor(user, function continuewith(result) { tweets = result; somethingfinished(); }); stackoverflow.getanswersfor(question, function continuewith(result) { answers = result; somethingfinished(); }); foursquare.getcheckinsby(user, function continuewith(result) { checkins=result; somethingfinished(); }); var finished = 0; function somethingfinished() { if (++finished === 3) ui.show(tweets, answers, checkins); } this also makes error handling quite an adventure.

Chrome Authority - Archive of obsolete content
from this you can access less-frequently-used properties like components.stack and components.issuccesscode.

Inline options - Archive of obsolete content
some discussion on the subject at stackoverflow: how to use addeventlistener on inputchanged of inline options display notifications if you want to use the settings ui for anything more than storing preferences, then you will probably need to initialize them when they first appear.

Index of archived content - Archive of obsolete content
plementation (1999) tracevis transforming xml with xslt:mozilla xslt transforming xml with xslt:the netscape xslt treehydra treehydra build instructions treehydra manual tuning pageload urischeme uris and urls uriloader using addresses of stack variables with nspr threads on win16 using cross commit using gdb on wimpy computers venkman using breakpoints in venkman venkman internals venkman introduction video presentations when to use ifdefs writing textual data xml in mozilla ...

Editor Embedding Guide - Archive of obsolete content
getcommandstate "state_attribute" (cstring) docommand "state_attribute" (cstring) note there must be a clear undo stack or this will not work.

Exception logging in JavaScript - Archive of obsolete content
all other errors are reported when the last javascript frame on the stack returns to a c++ caller without handling the exception.

Block and Line Layout Cheat Sheet - Archive of obsolete content
nslinebox a block consists of lines and other blocks, stacked vertically.

Layout System Overview - Archive of obsolete content
frames are an encapsulation of a region on the screen, a region that contains geometry (size and location, stacking order).

Style System Overview - Archive of obsolete content
otherwise, we need to compute the struct, so nsrulenode::getstyledata calls nsrulenode::get*data, which initializes the correct one of the data structs on the stack (the structs used by nscssdeclaration) style data computation get*data calls nsrulenode::walkruletree, which walks from the style context's rule node towards the root rule node.

Migrate apps from Internet Explorer to Mozilla - Archive of obsolete content
it supports such standard debugging features as breakpoint management, call stack inspection, and variable/object inspection.

Tamarin-central rev 703:2cee46be9ce0 - Archive of obsolete content
recursive pcre testcases kills the stack on pocketpc builds ...

Venkman Internals - Archive of obsolete content
for example, framerecord represents a javascript stack frame.

Example Sticky Notes - Archive of obsolete content
say an attempt to assign this.innertext='something' will lead to circular setter call and stack overflow.

bottom - Archive of obsolete content
« xul reference home bottom type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the bottom edge of the element relative to the bottom edge of the stack.

left - Archive of obsolete content
« xul reference home left type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the left edge of the element relative to the left edge of the stack.

top - Archive of obsolete content
« xul reference home top type: string (representing an integer) for elements placed directly within a stack, specifies the pixel position of the top edge of the element relative to the top edge of the stack.

Deprecated and defunct markup - Archive of obsolete content
--neil 03 march 2011 <bulletinboard> (made to support left/top styles, but <stack> can now do as well) <gripper> (inside of <scrollbar><thumb>; not to be used by itself) <listboxbody> (internal use only; part of xbl for <listbox>) <menubutton> (experiment in combining buttons and menus; use <button type> instead) <nativescrollbar> (displayed a native scrollbar; had been for mac only with native themes on) <outliner> (former name for <tree>; <listbox> had been "<...

The Joy of XUL - Archive of obsolete content
it uses simple xul components like boxes, grids, and stacks to compose views for the weeks, days, and months.

Adding more elements - Archive of obsolete content
find files example so far source view next, we will look at how to create stacks.

Box Objects - Archive of obsolete content
some of these subtypes, such as the stack or listbox are needed for more complex layouts than the basic box, while others such as the button are used only to add extra mouse and key event handling.

Grids - Archive of obsolete content
it creates an effect much like a grid of stack elements.

Groupboxes - Archive of obsolete content
note that the groupbox has a vertical orientation by default which is necessary to have the text elements stack in a single column.

Tabboxes - Archive of obsolete content
for example, to place the tabs along the left side, change the orientation of the tabs element to vertical to make the tabs appear vertically stacked.

XUL Tutorial - Archive of obsolete content
introduction xul structure the chrome url manifest files simple elements creating a window adding buttons adding labels and images input controls numeric controls list controls progress meters adding html elements using spacers more button features the box model the box model element positioning box model details groupboxes adding more elements more layout elements stacks and decks stack positioning tabboxes grids content panels splitters toolbars and menus toolbars simple menu bars more menu features popup menus scrolling menus events and scripts adding event handlers more event handlers keyboard shortcuts focus and selection commands updating commands broadcasters and observers document object model document object model modifying...

Accessibility/XUL Accessibility Reference - Archive of obsolete content
0" /> as progress advances, jaws indicates percentage to the user radio see radiogroup radiogroup <label value='<!--radio group-->' control='radioid' /> <radiogroup id='radioid'> <radio selected="true" label='<!--option1-->' /> <radio label='<!--option2-->' /> </radiogroup> row see grid rows see grid stack all elements can be focused, even if not visible due to being hidden under something else statusbar <statusbar> <statusbarpanel label="<!--status bar-->" flex="1"/> </statusbar> read using jaws with insert+page down statusbarpanel see statusbar tab see tabbox tabbox <tabbox> <tabs> <tab label="<!--tab tex...

deck - Archive of obsolete content
, haschildnodes(), insertbefore(), isdefaultnamespace(), isequalnode, issamenode, issupported(), lookupnamespaceuri, lookupprefix, normalize(), queryselector(), queryselectorall(), removeattribute(), removeattributenode(), removeattributens(), removechild(), removeeventlistener(), replacechild(), setattribute(), setattributenode(), setattributenodens(), setattributens(), setuserdata related stack ...

elements - Archive of obsolete content
header listitem m member menu menubar menuitem menulist menupopup menuseparator o observes overlay p page popup popupset preference preferences prefpane prefwindow progressmeter r radio radiogroup resizer richlistbox richlistitem resizer row rows rule s script scrollbar scrollbox scrollcorner separator spacer splitter stack statusbar statusbarpanel stringbundle stringbundleset t tab tabbrowser tabbox tabpanel tabpanels tabs template textnode textbox titlebar toolbar toolbarbutton toolbargrippy toolbaritem toolbarpalette toolbarseparator toolbarset toolbarspacer toolbarspring toolbox tooltip tree treecell treechildren treecol treecols treeitem treerow ...

Archived Mozilla and build documentation - Archive of obsolete content
resources are identified by uri "uniform resource identifier" (taken from rfc 2396): urischeme list of mozilla supported uri schemes using addresses of stack variables with nspr threads on win16 this is a cautionary note that may be old information for some of you.

NPN_GetAuthenticationInfo - Archive of obsolete content
description plugin which implement their own http networking stack (such as the java plugin) may want to use the standard http auth prompts and password managed of the browser.

NPN_GetValueForURL - Archive of obsolete content
description this entry point is designed to allow plugins which implement their own http stacks to form requests to the web server in the same way the browser does.

Debug.msTraceAsyncCallbackCompleted - Archive of obsolete content
indicates that the callback stack associated with a previously specified asynchronous operation has completed.

Debug.msTraceAsyncCallbackStarting - Archive of obsolete content
the debug.mstraceasynccallbackstarting function associates the callback stack with a previously specified asynchronous operation.

Microsoft JavaScript extensions - Archive of obsolete content
objects activexobject debug enumerator vbarray functions getobject scriptengine scriptenginebuildversion scriptenginemajorversion scriptengineminorversion statements @cc-on @if @set other date.getvardate() error.description error.number error.stacktracelimit ...

Index - Game development
the server is based on node.js vs mysql, the client made in four variant on a javascript frameworks for 2d canvas js , three.js , webgl2 vs glmatrix and 2d canvas with matter.js in typescript to complete the stack.

Tiles and tilemaps overview - Game development
if characters or other game sprites are drawn in the middle of the layer stack, this allows for interesting effects such as having characters walking behind trees or buildings.

Visual JS GE - Game development
the server is based on node.js vs mysql, the client made in four variant on a javascript frameworks for 2d canvas js , three.js , webgl2 vs glmatrix and 2d canvas with matter.js in typescript to complete the stack.

Canonical order - MDN Web Docs Glossary: Definitions of Web-related terms
on stack overflow provides useful further discussion.

Compile - MDN Web Docs Glossary: Definitions of Web-related terms
learn more general knowledge compiler on wikipedia the gnu compiler collection (gcc) learning resources base cs introduction on compilers a big list of learning material on stackoverflow ...

Gecko - MDN Web Docs Glossary: Definitions of Web-related terms
this means that gecko includes, among other things, a networking stack, graphics stack, layout engine, a javascript virtual machine, and porting layers.

Gonk - MDN Web Docs Glossary: Definitions of Web-related terms
since firefox os has full control over gonk, we can expose interfaces to gecko that aren't accessible on other operating systems, for example the full telephony stack and display frame buffer.

UDP (User Datagram Protocol) - MDN Web Docs Glossary: Definitions of Web-related terms
udp is suitable for purposes where error checking and correction are either not necessary or are performed in the application; udp avoids the overhead of such processing in the protocol stack.

Styling tables - Learn web development
ca neue', helvetica, arial, sans-serif; } thead th, tfoot th { font-family: 'rock salt', cursive; } th { letter-spacing: 2px; } td { letter-spacing: 1px; } tbody td { text-align: center; } tfoot th { text-align: right; } there is nothing really specific to tables here; we are generally tweaking the font styling to make things easier to read: we have set a global sans-serif font stack; this is purely a stylistic choice.

Introduction to CSS layout - Learn web development
let's look at a quick html example: <p>i love my cat.</p> <ul> <li>buy cat food</li> <li>exercise</li> <li>cheer up friend</li> </ul> <p>the end!</p> by default, the browser will display this code as follows: note here how the html is displayed in the exact order in which it appears in the source code, with elements stacked up on top of one another — the first paragraph, followed by the unordered list, followed by the second paragraph.

Responsive design - Learn web development
on narrow screens the layout displays the boxes stacked on top of one another: on wider screens they move to two columns: note: you can find the live example and source code for this example on github.

What are browser developer tools? - Learn web development
the call stack section shows you what code was executed to get to the current line.

Test your skills: Form validation - Learn web development
you can find everything you need to answer these questions at our regular expression reference, and by searching on stack overflow.

HTML Cheatsheet - Learn web development
instead, they stack like paragraphs in an essay or toy blocks in a tower.

Index - Learn web development
264 introduction to automated testing article, automation, beginner, codingscripting, learn, sauce labs, testing, tools, web stack, cross browser this was quite a ride, but i'm sure you can start to see the benefits of using automation tools to do some of the heavy lifting in terms of testing.

Video and Audio APIs - Learn web development
the frequency with which this event fires depends on your browser, cpu power, etc (see this stackoverflow post).

Client-Server Overview - Learn web development
6pqzbfmuat; dwf_section_edit=false; dwf_sg_task_completion=false; _ga=ga1.2.1688886003.1471911953; ffo=true csrfmiddlewaretoken=zipujsazv6pcgcbjscj1zu6pqzbfmuat&user-username=hamishwillee&user-fullname=hamish+willee&user-title=&user-organization=&user-location=australia&user-locale=en-us&user-timezone=australia%2fmelbourne&user-irc_nickname=&user-interests=&user-expertise=&user-twitter_url=&user-stackoverflow_url=&user-linkedin_url=&user-mozillians_url=&user-facebook_url= the main difference is that the url doesn't have any parameters.

Getting started with Ember - Learn web development
increasing cohesion among many team's technology stacks community-backed "best practices" allow for faster long-term development speed.

Deployment and next steps - Learn web development
svelte questions on stackoverflow: questions with the svelte tag at so.

Using Vue computed properties - Learn web development
add the described <h2> and update the <ul> inside your app's template as follows: <h2 id="list-summary">{{listsummary}}</h2> <ul aria-labelledby="list-summary" class="stack-large"> <li v-for="item in todoitems" :key="item.id"> <to-do-item :label="item.label" :done="item.done" :id="item.id"></to-do-item> </li> </ul> you should now see the list summary in your app, and the total number of items update as you add more todo items!

Introduction to cross browser testing - Learn web development
there are commercial tools available such as sauce labs, browser stack, endtest, lambdatest, testingbot, and crossbrowsertesting that do this kind of thing for you, without you having to worry about the setup, if you wish to invest some money in your testing.

Strategies for carrying out testing - Learn web development
there are also commercial tools available such as sauce labs, browser stack and lambdatest that do this kind of thing for you, without you having to worry about the setup, if you wish to invest some money in your testing.

Cross browser testing - Learn web development
in this article, we look at what is available, how to use task runners, and the basics of how to use commercial browser test automation apps such as sauce labs and browser stack.

Client-side tooling overview - Learn web development
development-related forums to ask questions on about what tools to use, for example mdn learn discourse, or stack overflow.

Debugging OpenGL
this makes debugging crashes caused by an opengl call much easier, since the stack you see will match where the call was issued, rather than some time in the future when it happens to run and crash.

Debugging on Mac OS X
for example, type js to see the javascript stack.

Debugging
miscellaneous debugging safari some tips for debugging safari debugging chrome some tips for debugging chrome debugging internet explorer some tips for debugging internet explorer providing useful information to the mozilla developers how to get a stacktrace for a bug report useful information you can provide about a crash.

CSS <display-xul> component
alues: syntax -moz-box obsolete since gecko 64 xul box, mostly equivalent to flex -moz-inline-box obsolete since gecko 64 xul inline box, mostly equivalent to inline-flex -moz-grid obsolete since gecko 62 xul grid -moz-inline-grid obsolete since gecko 62 xul inline grid -moz-grid-group obsolete since gecko 62 xul grid group -moz-grid-line obsolete since gecko 62 xul grid line -moz-stack obsolete since gecko 62 xul stack -moz-inline-stack obsolete since gecko 62 xul inline stack -moz-deck obsolete since gecko 62 xul deck -moz-popup obsolete since gecko 62 xul popup all xul display values, with the exception of -moz-box and -moz-inline-box, have been removed in bug 1288572.

Overview of Mozilla embedding APIs
typically, instances of this class are stack allocated, and wrap ascii arguments which must be converted into ucs2.

Embedding the editor
that state would have to include the document, undo stack, and typing state.

How to get a process dump with Windows Task Manager
see also how to get a stacktrace for a bug report [en-us] how to create a user-mode process dump file in windows vista and in windows 7 (msdn) ...

How to Report a Hung Firefox
if you suspect a hang (as opposed to slow performance), wait one minute on an idle system before getting the stack trace.

Introduction to Layout in Mozilla
t model construction content arrives from network via nsistreamlistener::ondataavailable parser tokenizes & processes content; invokes methods on nsicontentsink with parser node objects some buffering and fixup occurs here opencontainer, closecontainer, addleaf content sink creates and attaches content nodes using nsicontent interface content sink maintains stack of “live” elements more buffering and fixup occurs here insertchildat, appendchildto, removechildat frame construction content sink uses nsidocument interface to notify of Δs in content model contentappended, contentinserted, contentremoved presshell is registered as document observer receives contentappended, etc.

OS.File for the main thread
file.close(); this example is from stackoverflow: os.file check last modified date before os.read os.file.openunique() creates and opens a file with a unique name.

Mozilla MathML Status
elementary math element [- attribute] notes mstack not implemented.

mozilla::MonitorAutoEnter
important: when a mozilla::monitorautoenter is live on the stack, your code is guaranteed to own the underlying mozilla::monitor.

mozilla::MutexAutoLock
important: when a mozilla::mutexautolock is the mutex raii wrapper most recently pushed on the stack, your code is guaranteed to own the underlying mozilla::mutex.

mozilla::MutexAutoUnlock
important: when a mozilla::mutexautounlock is the mutex raii wrapper most recently pushed on the stack, your code is guaranteed not to own the underlying mozilla::mutex.

BloatView
specified by setting xpcom_mem_log_classes to a comma-separated list of names: xpcom_mem_log_classes=myclass,myotherclass,deliberatelyleakedclass mach mochitest [options] test harness scripts typically accept a --setenv option for specifying environment variables, which may be more convenient in some cases: mach mochitest --setenv=xpcom_mem_log_classes=myclass [options] for getting allocation stacks in automation, you can add the appropriate --setenv options to the test configurations for the platforms you're interested in.

Power profiling overview
with stack traces that clearly pinpoint specific parts of the code as being responsible.

Profiling with the Gecko Profiler and Local Symbols on Windows
if you're building a beta or release channel version, and you want proper c++ callstacks in your profiles, add ac_add_options --enable-profiling to your firefox .mozconfig file.

Reporting a Performance Problem
wait until the "symbolicating call stacks" notification disappears before sharing the profile.

TimerFirings logging
2082435840[100445640]: [81190] fn timer (one_shot 8000 ms): [from dladdr] gfxfontinfoloader::delayedstartcallback(nsitimer*, void*) second, on linux the code uses dladdr to get the symbol library and address, which can be post-processed by tools/rb/fix_stacks.py.

Performance
memory profiling and leak detection tools the developer tools "memory" panel the memory panel in the devtools supports taking heap snapshots, diffing them, computing dominator trees to surface "heavy retainers", and recording allocation stacks.

A guide to searching crash reports
proto signature the "proto signature" field is just the raw unprocessed crash stack concatenated together.

Crash reporting
for more information, see how to get a stacktrace for a bug report.

Atomic Operations
these functions operate on 32-bit integers: pr_atomicincrement pr_atomicdecrement pr_atomicset pr_atomicadd these functions implement a simple stack data structure: pr_createstack pr_stackpush pr_stackpop pr_destroystack ...

Introduction to NSPR
these resources include the thread stack and the cpu register set (including pc).

PRDescIdentity
there are three well-known identities: pr_invalid_io_layer, an invalid layer identity, for error return pr_top_io_layer, the identity of the top of the stack pr_nspr_io_layer, the identity used by nspr proper layers are created by pr_getuniqueidentity.

PR_CreateIOLayerStub
the caller should override appropriate contents of the file descriptor returned before pushing it onto the protocol stack.

Threads
these resources include a stack and the cpu registers (including pc).

An overview of NSS Internals
it might be interesting to mention a property of the nspr file descriptors, which are stacked in layers.

Index
it might be interesting to mention a property of the nspr file descriptors, which are stacked in layers.

NSS 3.12.4 release notes
l on windows bug 485155: nss_enable_pkix_verify=1 causes sec_error_unknown_issuer errors bug 485527: rename the _x86_ macro in lib/freebl bug 485658: vfychain -p reports revoked cert bug 485745: modify fipstest.c to support cavs 7.1 drbg testing bug 486304: cert7.db/cert8.db corruption when importing a large certificate (>64k) bug 486405: allocator mismatches in pk12util.c bug 486537: disable execstack in freebl x86_64 builds on linux bug 486698: facilitate the building of major components independently and in a chain manner by downstream distributions bug 486999: calling ssl_setsockpeerid a second time leaks the previous value bug 487007: make lib/jar conform to nss coding style bug 487162: ckfw/capi build failure on windows bug 487239: nssutil.rc doesn't compile on wince bug 487254: sftkmod.c...

NSPR functions
pr_secondstointerval pr_millisecondstointerval nspr i/o layering nspr file descriptors can be layered, corresponding to the layers in the network stack.

NSS environment variables
nss_shared_db 3.12 nss_disable_arena_free_list string (any non-empty value) define this variable to get accurate leak allocation stacks when using leak reporting software.

Installing Pork
install the pork stack pork is a set of tools written at mozilla for refactoring c++.

Introduction to the JavaScript shell
stackquota([number]) get or set the script stack quota.

JIT Optimization Strategies
call call_inline a function call f(x) usually pushes a frame onto the call stack.

JSAPI Cookbook
// javascript throw exc; /* jsapi */ js_setpendingexception(cx, exc); return false; when js_reporterror creates a new error object, it sets the filename and linenumber properties to the line of javascript code currently at the top of the stack.

JS::Add*Root
note that this means that if the root is meant to live past the end of a function, the address of a local (stack-based) variable may not be used for vp/rp.

JS::PersistentRooted
these roots can be used in heap-allocated data structures, so they are not associated with any particular jscontext or stack.

JSCheckAccessOp
jscheckaccessop implementations generally work by using jsdbgapi functions such as js_frameiterator and js_stackframeprincipals to obtain the principals of the code attempting the checked operation, then examining those principals and comparing them with the system's security policy.

JSObjectPrincipalsFinder
the two debugger functions js_stackframeprincipals and js_evalframeprincipals also use this callback.

JSRuntime
it contains the global object and the execution stack.

JS_Add*Root
note that this means that if the root is meant to live past the end of a function, the address of a local (stack-based) variable may not be used for rp.

JS_DestroyScript
the script must not be currently executing (in any context, at any level of the stack) and must not be used again afterwards.

JS_GetScopeChain
these objects represent the lexical scope of the currently executing statement or expression, not the call stack, so they include: the variable objects of any enclosing functions or let statements or expressions, and any objects selected by enclosing with statements, in order from the most-nested scope outward; lastly the global object against which the function was created.

JS_IsAssigning
syntax jsbool js_isassigning(jscontext *cx); name type description description js_isassigning returns true if a script is executing and its current bytecode is a set (assignment) operation, even if there are native (no script) stack frames between the script and the caller to js_isassigning.

JS_SetCheckObjectAccessCallback
this callback is also used to check access to the caller property of function objects (as, for example, when the javascript engine creates a stack trace) and to check access from scripts to properties with scripted getters or setters.

JS_SetGCZeal
6 verify stack rooting.

SpiderMonkey 45
65486) js_checkforinterrupt (bug 1058695) js::mapdelete (bug 1159469) js::mapforeach (bug 1159469) js::newsetobject (bug 1159469) js::setsize (bug 1159469) js::sethas (bug 1159469) js::setdelete (bug 1159469) js::setadd (bug 1159469) js::setclear (bug 1159469) js::setkeys (bug 1159469) js::setvalues (bug 1159469) js::setentries (bug 1159469) js::setforeach (bug 1159469) js::exceptionstackornull (bug 814497) js::copyasyncstack (bug 1160307) js::getsavedframesource (bug 1216819) js::getsavedframeline (bug 1216819) js::getsavedframecolumn (bug 1216819) js::getsavedframefunctiondisplayname (bug 1216819) js::getsavedframeasynccause (bug 1216819) js::getsavedframeasyncparent (bug 1216819) js::getsavedframeparent (bug 1216819) js::buildstackstring (bug 1133191) js::flushperform...

SpiderMonkey: The Mozilla JavaScript runtime
spidermonkey internals: gc separate internals article on the gc spidermonkey internals: hacking tips collection of helpful tips & tools for hacking on the engine related topics javascript foss projects using or based on spidermonkey releases spidermonkey release notes current and past versions: 52, 45, 38, 31, 24, 17 community mailing list spidermonkey questions on stack overflow report a bug ...

Gecko Roles
a specialized pane that allows its children to be drawn in layers, providing a form of stacking order.

Finishing the Component
this points out an important drawback of xpcom, which is that you cannot create an object on the stack.

Interfacing with the XPCOM cycle collector
the collector does not know how to find temporary owning pointers that exist on the stack, so it is important that it only run from near the top-loop of the program.

Components.Exception
syntax var exception = [ new ] components.exception([ message [, result [, stack [, data ] ] ] ]); parameters message a string which can be displayed in the error console when your exception is thrown or in other developer-facing locations, defaulting to 'exception' result the nsresult value of the exception, which defaults to components.results.ns_error_failure stack an xpcom stack to be set on the exception (defaulting to the current stack chain) data any add...

Components.utils.importGlobalProperties
knowing that, we can just get a valid blob by importing a known module that has the objects, such as services.jsm const {blob, file, services} = cu.import("resource://gre/modules/services.jsm", {}); reference: stackoverflow :: use blob on firefox add-on hiddendomwindow the hidden domwindow has all of these objects automatically imported.

Components object
ces array of interfaces by interface name interfacesbyid array of interfaces by iid issuccesscode function to determine if a given result code is a success code lastresult result code of most recent xpconnect call manager the global xpcom component manager results array of known result codes by name returncode pending result for current call stack current javascript call stack utils provides access to several useful features utils.atline provides access to the value of the atline property in the javascript environment.

Language bindings
the scriptable methods on the nsicomponentmanager interface can be called directly on this object.components.resultscomponents.results is a read-only object whose properties are the names listed as the first parameters of the macros in js/xpconnect/src/xpc.msg (also at table of errors), with the value of each corresponding to that constant's value.components.returncodecomponents.stackcomponents.stack is a read only property of type nsistackframe (idl definition) that represents a snapshot of the current javascript callstack.

nsAutoString
class declaration nstautostring_chart subclass of nststring_chart that adds support for stack-based string allocation.

nsCAutoString
class declaration nstautostring_chart subclass of nststring_chart that adds support for stack-based string allocation.

imgIContainer
it is an error to pass this flag from a call stack that originates in a decoder (that is, from a decoder observer event).

nsIAccessibleRole
a specialized pane that allows its children to be drawn in layers, providing a form of stacking order.

nsIConsoleService
note: to guard against stack overflows from listeners which could log messages (this could be done inadvertently through listeners implemented in javascript), we do not call any listeners when another error is already being logged.

nsISyncMessageSender
new rpc messages may be issued even if, earlier on the call stack, we are waiting for a reply to an earlier sendrpcmessage() call.

nsITelemetry
etry;1 as a service: let telemetry = components.classes["@mozilla.org/base/telemetry;1"] .getservice(components.interfaces.nsitelemetry); method overview jsval gethistogrambyid(in acstring id); jsval snapshothistograms(in uint32_t adataset, in boolean asubsession, in boolean aclear); jsval getkeyedhistogrambyid(in acstring id); void capturestack(in acstring name); jsval snapshotcapturedstacks([optional] in boolean clear); nsisupports getloadedmodules(); jsval snapshotkeyedhistograms(in uint32_t adataset, in boolean asubsession, in boolean aclear); void sethistogramrecordingenabled(in acstring id, in boolean enabled); void asyncfetchtelemetrydata(in nsifetchtelemetrydatacallback acallback); ...

nsIWebContentHandlerRegistrar
to take from: http://mxr.mozilla.org/mozilla-release/source/browser/components/feeds/src/webcontentconverter.js#372 and http://stackoverflow.com/questions/24900655/use-registerprotocolhandler-without-contentwindow place holder see also nsiwebcontentsonverterservice (under construction: page doesnt exist yet) registerprotocolhandler from non-privelaged scope web api interfaces > navigator.registercontenthandler() web api interfaces > navigator.registerprotocolhandler() ...

nsIWindowWatcher
note: this method may examine the javascript context stack for purposes of determining the security context to use for the search for a given window named aname.

nsIXMLHttpRequest
though actually, if you use addeventlistener from c++ weird things will happen too, since the result will depend on what js happens to be on the stack when you do it....

XPCOM Interface Reference by grouping
nsiproperties nsiproperty nsipropertybag nsipropertybag2 nsipropertyelement nsiserversocket nsiserversocketlistener nsiservicemanager nsisocketprovider nsisocketproviderservice nsisockettransport nsisockettransportservice nsisupports nsiuuidgenerator debug nsistackframe device display nsiscreen nsiscreenmanager geolocation nsigeolocationprovider nsigeolocationupdate orientation nsiacceleration nsiaccelerationlistener nsiaccelerometer misc ...

Getting Started Guide
you should use nscomptr on the stack, where it makes calling queryinterface almost pleasant, and eliminates the complex logic that falls out of error handling.

The Valgrind Test Job
understanding errors for each problem that valgrind finds, it emits a message describing the problem, along with a stack trace indicating where the problem occurs.

ctypes.open
see: http://stackoverflow.com/questions/19382201/how-to-load-dll-from-sdk-addon-data-folder it is important to note that custom native files cannot be loaded through chrome:// or resource:// uris.

js-ctypes
mailing list newsgroup rss feed stackoverflow - jsctypes related topics xpcom in gecko 2 - binary components ...

Break on DOM mutation - Firefox Developer Tools
the panel on the right shows that execution is "paused on dom mutation" and you, as with any other breakpoint, you can see the call stack and view any watch expressions you may have set up.

Debug worker threads - Firefox Developer Tools
you can set a breakpoint (or logpoint) on any active worker thread: when execution is paused in a worker thread, the context of the debugger is updated to show the correct breakpoints, call stack, etc., just as you'd expect.

Breaking on exceptions - Firefox Developer Tools
starting in firefox 80, a disclosure triangle within the tooltip reveals a stack trace.

Debug eval sources - Firefox Developer Tools
the name of the source will also appear in stack traces appearing in the web console.

Using the Debugger map scopes feature - Firefox Developer Tools
when you click the increment button on the page and hit the breakpoint, an additional section is added to the right-hand panel below the call stack to display variables mapped from the original scope, like this: as useful as this is, it would be even nicer if you could view the original code (before it was packages into the "bundle.js" file.

Debugger.Environment - Firefox Developer Tools
spidermonkey creates debugger.environment instances as needed as the debugger inspects stack frames and function objects; calling debugger.environment as a function or constructor raises a typeerror exception.

Debugger.Script - Firefox Developer Tools
when execution reaches the given instruction, spidermonkey calls the hit method ofhandler, passing a debugger.frame instance representing the currently executing stack frame.

Tutorial: Set a breakpoint - Firefox Developer Tools
then it evaluates the expression what in the given stack frame, and logs its result.

Debugger.Object - Firefox Developer Tools
theframe argument is the current stack frame, whose code is about to perform the operation on the object being reported.

Deprecated tools - Firefox Developer Tools
unlike in scratchpad, errors are properly displayed in the output with an expandable stacktrace, making it easier to debug the code you're currently writing.

Examine Event Listeners - Firefox Developer Tools
the inspector shows the word "event" next to elements in the html pane, that have event listeners bound to them: click the icon, then you'll see a popup listing all the event listeners bound to this element: each line contains: a right-pointing arrowhead; click to expand the row and show the listener function source code a curved arrow pointing to a stack; click it to show the code for the handler in the debugger the name of the event for which a handler was attached to this element the name and line number for the listener; you can also click here to expand the row and view the listener function source code a label indicating whether the event bubbles a label indicating the system that defines the event.

Frame rate - Firefox Developer Tools
switch to the flame chart to see the call stack at that point: the offending function is called dopointlesscomputations(), and it's defined in "main.js".

Performance - Firefox Developer Tools
you get four sub-tools to examine aspects of the profile in more detail: the waterfall shows the different operations the browser was performing, such as executing layout, javascript, repaints, and garbage collection the call tree shows the javascript functions in which the browser spent most of its time the flame chart shows the javascript call stack over the course of the recording the allocations view shows the heap allocations made by your code over the course of the recording.

Tips - Firefox Developer Tools
hover the "js" icon within the "cause" column to see the javascript stack trace, which caused the request.

Split console - Firefox Developer Tools
as usual, $0 works as a shorthand for the element currently selected in the inspector: when you use the split console with the debugger, the console's scope is the currently executing stack frame.

The JavaScript input interpreter - Firefox Developer Tools
the console suggests completions from the scope of the currently executing stack frame.

BaseAudioContext.createWaveShaper() - Web APIs
we found the below distortion curve code on stack overflow.

CanvasRenderingContext2D.restore() - Web APIs
the canvasrenderingcontext2d.restore() method of the canvas 2d api restores the most recently saved canvas state by popping the top entry in the drawing state stack.

Finale - Web APIs
questions stack overflow questions tagged with "canvas".

Console API - Web APIs
interfaces console provides rudimentary debugging functionality, including logging, stack traces, timers, and counters.

Document.all - Web APIs
more information about this can be found in this answer from stackoverflow.

Document.open() - Web APIs
starting with gecko 1.9.2, document.open() uses the principal of the document whose uri it uses, instead of fetching the principal off the stack.

DocumentOrShadowRoot.msElementsFromRect() - Web APIs
var nodelist = document.mselementsfromrect(x,y,width,height) var nodelist = document.mselementsfrompoint(x,y) the returned nodelist is sorted by z-index so that you can tell the relative stacking order of the elements.

How whitespace is handled by HTML, CSS, and in the DOM - Web APIs
blocks occupy the full width available and are stacked on top of each other, which means that we end up with a layout composed of this list of blocks: <block>⏎⇥</block> <block>◦◦hello◦◦</block> <block>⏎◦◦◦</block> <block>◦◦world!◦◦</block> <block>◦◦⏎</block> this is then simplified further by applying the processing rules for whitespace in inline formatting contexts to these blocks: <block></block> <blo...

EventSource - Web APIs
(from stackoverflow).

EventTarget.dispatchEvent() - Web APIs
the event handlers run on a nested callstack; they block the caller until they complete, but exceptions do not propagate to the caller.

EventTarget - Web APIs
nttarget = function() { this.listeners = {}; }; eventtarget.prototype.listeners = null; eventtarget.prototype.addeventlistener = function(type, callback) { if (!(type in this.listeners)) { this.listeners[type] = []; } this.listeners[type].push(callback); }; eventtarget.prototype.removeeventlistener = function(type, callback) { if (!(type in this.listeners)) { return; } var stack = this.listeners[type]; for (var i = 0, l = stack.length; i < l; i++) { if (stack[i] === callback){ stack.splice(i, 1); return; } } }; eventtarget.prototype.dispatchevent = function(event) { if (!(event.type in this.listeners)) { return true; } var stack = this.listeners[event.type].slice(); for (var i = 0, l = stack.length; i < l; i++) { stack[i].call(th...

ExtendableEvent - Web APIs
if waituntil() is called outside of the extendableevent handler, the browser should throw an invalidstateerror; note also that multiple calls will stack up, and the resulting promises will be added to the list of extend lifetime promises.

Using the Frame Timing API - Web APIs
the call tree shows where the application is spending most of its time, whereas the flame chart shows the state of the javascript stack for the code at every millisecond during the performance profile.

HTMLElement.outerText - Web APIs
example see this stackoverflow answer.

History.pushState() - Web APIs
in an html document, the history.pushstate() method adds a state to the browser's session history stack.

LocalFileSystem - Web APIs
to learn more, see this stackoverflow answer.

MediaRecorderErrorEvent() - Web APIs
some user agents add to the error object other properties that provide information such as stack dumps, the name of the javascript file and the line number where the error occurred, and other debugging aids, but you should not rely on this information in a production environment.

Using the MediaStream Recording API - Web APIs
for example, in web dictaphone we have three main ui areas, stacked vertically.

Using server-sent events - Web APIs
this limit is per browser + domain, which means that you can open 6 sse connections across all of the tabs to www.example1.com and another 6 sse connections to www.example2.com (per stackoverflow).

WaveShaperNode.curve - Web APIs
we found the below distortion curve code on stack overflow.

WaveShaperNode.oversample - Web APIs
we found the below distortion curve code on stack overflow.

WaveShaperNode - Web APIs
we found the below distortion curve code on stack overflow.

Web accessibility for seizures and physical reactions - Accessibility
formula to determine brightness of rgb color stack exchange discussion thread how the color red influences our behavior scientific american by susana martinez-conde, stephen l.

Web Accessibility: Understanding Colors and Luminance - Accessibility
see the stack exchange article, "formula to determine the brightness of rgb color".

-webkit-overflow-scrolling - CSS: Cascading Style Sheets
also creates a new stacking context.

::backdrop - CSS: Cascading Style Sheets
/* backdrop is only displayed when dialog is opened with dialog.showmodal() */ dialog::backdrop { background: rgba(255,0,0,.25); } all full-screen elements are placed in a last-in/first out (lifo) stack in the top layer, which is a special layer in the viewport which is always rendered last (and therefore on top) before drawing the viewport's contents to the screen.

prefers-reduced-data - CSS: Cascading Style Sheets
in this example the montserrat-regular.woff2 font file will neither be preloaded nor downloaded if the user prefers reduced data, in this case the "system font stack" will serve as the fallback font: html <head> <link rel="preload" href="fonts/montserrat-regular.woff2" as="font" media="(prefers-reduced-data: no-preference)" crossorigin> <link rel="stylesheet" href="style.css"> </head> css @media (prefers-reduced-data: no-preference) { @font-face { font-family: montserrat; font-style: normal; font-weight: 400; font-...

Using multiple backgrounds - CSS: Cascading Style Sheets
example in this example, three backgrounds are stacked: the firefox logo, an image of bubbles, and a linear gradient: html <div class="multi-bg-example"></div> css .multi-bg-example { width: 100%; height: 400px; background-image: url(https://mdn.mozillademos.org/files/11305/firefox.png), url(https://mdn.mozillademos.org/files/11307/bubbles.png), linear-gradient(to right, rgba(30, 75, 115, 1), rgba(255, 255, 255, 0)); backgro...

CSS Containment - CSS: Cascading Style Sheets
the containing box creates a stacking context, therefore z-index can be used.

Cross-browser Flexbox mixins - CSS: Cascading Style Sheets
ent: horizontal; } -webkit-flex-direction: $value; -ms-flex-direction: $value; flex-direction: $value; } // shorter version: @mixin flex-dir($args...) { @include flex-direction($args...); } flexbox wrap the flex-wrap property controls whether the flex container is single-lined or multi-lined and the direction of the cross-axis, which determines the direction in which the new lines are stacked in.

Flow Layout and Writing Modes - CSS: Cascading Style Sheets
the block flow direction is the direction in which boxes, for example paragraphs, stack in that writing mode.

OpenType font features guide - CSS: Cascading Style Sheets
vertically stacked fractions.

Grid template areas - CSS: Cascading Style Sheets
for our layout above, we might like to have a very simple layout at narrow widths, defining a single column grid and stacking up our items.

CSS Positioned Layout - CSS: Cascading Style Sheets
reference css properties bottom clear float left position right top z-index guides understanding css z-index presents the notion of stacking context and explains how z-ordering works, with several examples.

Inline formatting context - CSS: Cascading Style Sheets
therefore a paragraph is a set of inline line boxes, stacked in the block direction.

CSS reference - CSS: Cascading Style Sheets
epts syntax and semantics css syntax at-rules cascade comments descriptor inheritance shorthand properties specificity value definition syntax css unit and value types values actual value computed value initial value resolved value specified value used value layout block formatting context box model containing block layout mode margin collapsing replaced elements stacking context visual formatting model dom-css / cssom major object types documentorshadowroot.stylesheets stylesheets[i].cssrules cssrules[i].csstext (selector & style) cssrules[i].selectortext htmlelement.style htmlelement.style.csstext (just style) element.classname element.classlist important methods cssstylesheet.insertrule() cssstylesheet.deleterule() ...

Specificity - CSS: Cascading Style Sheets
for more information, visit: https://stackoverflow.com/questions/3706819/what-are-the-implications-of-using-important-in-css https://stackoverflow.com/questions/9245353/what-does-important-in-css-mean https://stackoverflow.com/questions/5701149/when-to-use-important-property-in-css https://stackoverflow.com/questions/11178673/how-to-override-important https://stackoverflow.com/questions/2042497/when-to-use-important-to-save-the-day-wh...

background-image - CSS: Cascading Style Sheets
the background images are drawn on stacking context layers on top of each other.

border-image-slice - CSS: Cascading Style Sheets
fill preserves the middle image region and displays it like a background image, but stacked above the actual background.

clip-path - CSS: Cascading Style Sheets
note: a computed value other than none results in the creation of a new stacking context the same way that css opacity does for values other than 1.

contain - CSS: Cascading Style Sheets
a new stacking context.

flex-direction - CSS: Cascading Style Sheets
syntax /* the direction text is laid out in a line */ flex-direction: row; /* like <row>, but reversed */ flex-direction: row-reverse; /* the direction in which lines of text are stacked */ flex-direction: column; /* like <column>, but reversed */ flex-direction: column-reverse; /* global values */ flex-direction: inherit; flex-direction: initial; flex-direction: unset; values the following values are accepted: row the flex container's main-axis is defined to be the same as the text direction.

flex-wrap - CSS: Cascading Style Sheets
if wrapping is allowed, it sets the direction that lines are stacked.

float - CSS: Cascading Style Sheets
additional squares would continue to stack to the right, until they filled the containing box, after which they would wrap to the next line.

mask-border - CSS: Cascading Style Sheets
as specifiedmask-border-source: as specified, but with <url> values made absolutemask-border-width: as specified, but with relative lengths converted into absolute lengthsanimation typeas each of the properties of the shorthand:mask-border-mode: discretemask-border-outset: discretemask-border-repeat: discretemask-border-slice: discretemask-border-source: discretemask-border-width: discretecreates stacking contextyes formal syntax <'mask-border-source'> | <'mask-border-slice'> [ / <'mask-border-width'>?

mask - CSS: Cascading Style Sheets
ths converted into absolute lengthsmask-composite: as specifiedanimation typeas each of the properties of the shorthand:mask-image: discretemask-mode: discretemask-repeat: discretemask-position: repeatable list of simple list of length, percentage, or calcmask-clip: discretemask-origin: discretemask-size: repeatable list of simple list of length, percentage, or calcmask-composite: discretecreates stacking contextyes formal syntax <mask-layer>#where <mask-layer> = <mask-reference> | <position> [ / <bg-size> ]?

mix-blend-mode - CSS: Cascading Style Sheets
formal definition initial valuenormalapplies toall elementsinheritednocomputed valueas specifiedanimation typediscretecreates stacking contextyes formal syntax <blend-mode>where <blend-mode> = normal | multiply | screen | overlay | darken | lighten | color-dodge | color-burn | hard-light | soft-light | difference | exclusion | hue | saturation | color | luminosity examples effect of different mix-blend-mode values <div class="grid"> <div class="col"> <div class="note">blending in isolation (no blending with the ba...

offset-path - CSS: Cascading Style Sheets
formal definition initial valuenoneapplies totransformable elementsinheritednocomputed valueas specifiedanimation typeas <angle>, <basic-shape> or <path()>creates stacking contextyes formal syntax none | ray( [ <angle> && <size>?

offset - CSS: Cascading Style Sheets
solute value, otherwise a percentageoffset-anchor: for <length> the absolute value, otherwise a percentageoffset-rotate: as specifiedanimation typeas each of the properties of the shorthand:offset-position: a positionoffset-path: as <angle>, <basic-shape> or <path()>offset-distance: a length, percentage or calc();offset-anchor: a positionoffset-rotate: as <angle>, <basic-shape> or <path()>creates stacking contextyes formal syntax [ <'offset-position'>?

opacity - CSS: Cascading Style Sheets
using opacity with a value other than 1 places the element in a new stacking context.

rotate - CSS: Cascading Style Sheets
formal definition initial valuenoneapplies totransformable elementsinheritednocomputed valueas specifiedanimation typea transformcreates stacking contextyes formal syntax none | <angle> | [ x | y | z | <number>{3} ] && <angle> examples rotate an element on hover html <div> <p class="rotate">rotation</p> </div> css * { box-sizing: border-box; } html { font-family: sans-serif; } div { width: 150px; margin: 0 auto; } p { padding: 10px 5px; border: 3px solid black; border-radius: 20px; width: 150px; font-size...

scale - CSS: Cascading Style Sheets
formal definition initial valuenoneapplies totransformable elementsinheritednocomputed valueas specifiedanimation typea transformcreates stacking contextyes formal syntax none | <number>{1,3} examples scaling an element on hover html <div> <p class="scale">scaling</p> </div> css * { box-sizing: border-box; } html { font-family: sans-serif; } div { width: 150px; margin: 0 auto; } p { padding: 10px 5px; border: 3px solid black; border-radius: 20px; width: 150px; font-size: 1.2rem; text-align: center; } .s...

transform-style - CSS: Cascading Style Sheets
formal definition initial valueflatapplies totransformable elementsinheritednocomputed valueas specifiedanimation typediscretecreates stacking contextyes formal syntax flat | preserve-3d examples transform style demonstration in this example we have a 3d cube created using transforms.

writing-mode - CSS: Cascading Style Sheets
this property specifies the block flow direction, which is the direction in which block-level containers are stacked, and the direction in which inline-level content flows within a block container.

CSS: Cascading Style Sheets
css key concepts: the syntax and forms of the language specificity, inheritance and the cascade css units and values box model and margin collapse the containing block stacking and block-formatting contexts initial, computed, used, and actual values css shorthand properties css flexible box layout css grid layout media queries animation cookbook the css layout cookbook aims to bring together recipes for common layout patterns, things you might need to implement in your sites.

Guide to Web APIs - Developer guides
on this page you'll find a complete list of all of the apis provided by the full web technology stack.

Overview of events and handlers - Developer guides
this will also need finding a good explanation of the events involved during page loading, such as discussed partially in this web page or in this stack overflow question.

Index - Developer guides
on this page you'll find a complete list of all of the apis provided by the full web technology stack.

Block-level elements - HTML: Hypertext Markup Language
you can visualize them as a stack of boxes.

<canvas>: The Graphics Canvas element - HTML: Hypertext Markup Language
stack overflow): browser maximum height maximum width maximum area chrome 32,767 pixels 32,767 pixels 268,435,456 pixels (i.e., 16,384 x 16,384) firefox 32,767 pixels 32,767 pixels 472,907,776 pixels (i.e., 22,528 x 20,992) safari 32,767 pixels 32,767 pixels 268,435,456 pixels (i.e., 16,384 x 16,384) ie 8,192 pixel...

Evolution of HTTP - HTTP
instead of sending http over a basic tcp/ip stack, netscape communications created an additional encrypted transmission layer on top of it: ssl.

Basics of HTTP - HTTP
articles overview of http describes what http is and its role in web architecture, including its position in the protocol stack.

An overview of HTTP - HTTP
due to the layered structure of the web stack, most of these operate at the transport, network or physical levels, becoming transparent at the http layer and potentially making a significant impact on performance.

A re-introduction to JavaScript (JS tutorial) - JavaScript
the name also shows up in the debugger and some stack traces, which can save you time when debugging.

Enumerability and ownership of properties - JavaScript
ue, true, this._enumerableandnotenumerable); }, // private static property checker callbacks _enumerable: function(obj, prop) { return obj.propertyisenumerable(prop); }, _notenumerable: function(obj, prop) { return !obj.propertyisenumerable(prop); }, _enumerableandnotenumerable: function(obj, prop) { return true; }, // inspired by http://stackoverflow.com/a/8024294/271577 _getpropertynames: function getallpropertynames(obj, iterateselfbool, iterateprototypebool, includepropcb) { var props = []; do { if (iterateselfbool) { object.getownpropertynames(obj).foreach(function(prop) { if (props.indexof(prop) === -1 && includepropcb(obj, prop)) { props...

Date.prototype.toLocaleString() - JavaScript
for this reason, you cannot expect to be able to compare the results of tolocalestring() to a static value: "1/1/2019, 01:00:00" === new date("2019-01-01t01:00:00z").tolocalestring("en-us"); // true in firefox and others // false in ie and edge note: see also this stackoverflow thread for more details and examples.

EvalError() constructor - JavaScript
ng an evalerror try { throw new evalerror('hello', 'somefile.js', 10); } catch (e) { console.log(e instanceof evalerror); // true console.log(e.message); // "hello" console.log(e.name); // "evalerror" console.log(e.filename); // "somefile.js" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // "@scratchpad/2:2:9\n" } specifications specification ecmascript (ecma-262)the definition of 'nativeerror constructor' in that specification.

Function.prototype.apply() - JavaScript
this is because the limit (and indeed, even the nature of any excessively-large-stack behavior) is unspecified.

Function.arguments - JavaScript
if function f appears several times on the call stack, the value of f.arguments represents the arguments corresponding to the most recent invocation of the function.

InternalError - JavaScript
internalerror.prototype.stack stack trace.

Intl.DateTimeFormat.prototype.format() - JavaScript
pare the results of format() to a static value: let d = new date("2019-01-01t00:00:00.000000z"); let formatteddate = intl.datetimeformat(undefined, { year: 'numeric', month: 'numeric', day: 'numeric', hour: 'numeric', minute: 'numeric', second: 'numeric' }).format(d); "1.1.2019, 01:00:00" === formatteddate; // true in firefox and others // false in ie and edge note: see also this stackoverflow thread for more details and examples.

Object.prototype.hasOwnProperty() - JavaScript
var buz = { fog: 'stack' }; for (var name in buz) { if (buz.hasownproperty(name)) { console.log('this is fog (' + name + ') for sure.

Promise.any() - JavaScript
this returned promise is then resolved/rejected asynchronously (as soon as the stack is empty) when any of the promises in the given iterable resolve, or if all the promises have rejected.

Promise.prototype.catch() - JavaScript
this is considered good practice in contrast to throwing strings; otherwise, the part doing the catching would have to perform checks to see if the argument was a string or an error, and you might lose valuable information like stack traces.

Promise.reject() - JavaScript
examples using the static promise.reject() method promise.reject(new error('fail')).then(function() { // not called }, function(error) { console.error(error); // stacktrace }); specifications specification ecmascript (ecma-262)the definition of 'promise.reject' in that specification.

RangeError - JavaScript
rangeerror.prototype.stack stack trace.

String.prototype.split() - JavaScript
see “how do you get a string to a character array in javascript?” on stackoverflow.

WebAssembly.CompileError() constructor - JavaScript
new webassembly.compileerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof compileerror); // true console.log(e.message); // "hello" console.log(e.name); // "compileerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly constructors' in that specification.

WebAssembly.LinkError() constructor - JavaScript
{ throw new webassembly.linkerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof linkerror); // true console.log(e.message); // "hello" console.log(e.name); // "linkerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'linkerror' in that specification.

WebAssembly.RuntimeError() constructor - JavaScript
new webassembly.runtimeerror('hello', 'somefile', 10); } catch (e) { console.log(e instanceof runtimeerror); // true console.log(e.message); // "hello" console.log(e.name); // "runtimeerror" console.log(e.filename); // "somefile" console.log(e.linenumber); // 10 console.log(e.columnnumber); // 0 console.log(e.stack); // returns the location where the code was run } specifications specification webassembly javascript interfacethe definition of 'webassembly.runtimeerror constructor' in that specification.

Optional chaining (?.) - JavaScript
for instance: let potentiallynullobj = null; let x = 0; let prop = potentiallynullobj?.[x++]; console.log(x); // 0 as x was not incremented stacking the optional chaining operator with nested structures, it is possible to use optional chaining multiple times: let customer = { name: "carl", details: { age: 82, location: "paradise falls" // detailed address is unknown } }; let customercity = customer.details?.address?.city; // … this also works with optional chaining function call let duration = vacations.trip?.gettime?.()...

switch - JavaScript
methods for multi-criteria case source for this technique is here: switch statement multiple cases in javascript (stack overflow) multi-case : single operation this method takes advantage of the fact that if there is no break below a case clause it will continue to execute the next case clause regardless if the case meets the criteria.

throw - JavaScript
execution of the current function will stop (the statements after throw won't be executed), and control will be passed to the first catch block in the call stack.

Strict mode - JavaScript
second, in strict mode it's no longer possible to "walk" the javascript stack via commonly-implemented extensions to ecmascript.

contains - XPath
syntax contains(haystack, needle) arguments haystack the string to be searched needle the string to look for as a substring of haystack returns true if haystack contains needle.

Using the WebAssembly JavaScript API - WebAssembly
starting soon in firefox, in addition to viewing webassembly as text, developers will be able to debug (place breakpoints, inspect the callstack, single-step, etc.) webassembly using the text format.