HTMLStyleElement.scoped - Web APIs
the htmlstyleelement.scoped property is a boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true). by default it contains the value of the scoped content attribute. ...
... the htmlstyleelement.scoped property is a boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true). by default it contains the value of the scoped content attribute. ...
... the htmlstyleelement.scoped property is a boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true). by default it contains the value of the scoped content attribute. ...

XPIDL Syntax
ike the c preprocessor, when a file is included multiple times, it acts as if the subsequent includes did not happen; this prevents the need for include guards. xpidl syntax (abnf) the root production here is idl_file. ...
...essor, when a file is included multiple times, it acts as if the subsequent includes did not happen; this prevents the need for include guards. xpidl syntax (abnf) the root production here is idl_file. ...
... literal = octal_literal / decimal_literal / hex_literal / floating_literal literal /= string_literal / char_literal literal /= "true" / "false" ; in regex: /"[^"\n]*["\n]/. yes, newline terminates. string_literal = 1*(%x22 *...
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Styling Vue components with CSS - Learn web development
need a terminal with node + npm installed. objective: to learn about styling vue components. styling vue components with css before we move on to add more advanced features to our app, we should add some basic css to make it look better. vue has three common approaches to styling apps: external css files. global styles in single file components (.vue files). component-scoped styles in single file components. to help familiarize you with each one, we'll use a combination of all three to give our app a nicer look and feel. styling with external css files you can include external css files and apply them globally to your app. let's look at how this is done. to start with, create a file called reset.css in the src/assets directory. files in this folder get processed...
...="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. this will help improve the spacing of our to-do items a bit. ...
...ul aria-labelledby="list-summary" class="stack-large"> adding scoped styles the last component we want to style is our todoitem component. to keep the style definitions close to the component we can add a <style> element inside it. however, if these styles alter things outside of this component, it could be challenging to track down the styles responsible, and fix the problem. this is where the scoped attribute can be useful — this attaches a unique html data attribute selector to all of your styles, preventing them from colliding globally. ...
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:scope - CSS: Cascading Style Sheets
when used from a dom api such as queryselector(), queryselectorall(), matches(), or element.closest(), :scope matches the element on which the method was called. syntax :scope examples identity match in this simple example, we demonstrate that using the :scope pseudo-class from the element.matches() method matches the element on which it's called. ...
... no support 20 — 32disabled disabled from version 20 until version 32 (exclusive): this feature is beh...
...scopechrome full support 27edge full support 79firefox full support 32notes full support 32notes notes firefox 55 removes support for <style scoped> but not for the :scope pseudo-class, which is still supported. <style scoped> made it possible to explicitly set up element scopes, but ongoing discussions about the design of this feature as well as lack of other implementations resulted in the decision to remove it. no support 20 — 32disabled disabled from version 20 until version 32 (exclusive): this feature is behind the layout.css.scope-pseudo.enabled preference (needs to be set to true). ...
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var - JavaScript
the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax var varname1 [= value1] [, varname2 [= value2] ... [, varnamen [= valuen]]]; varnamen variable name. it can be any legal identifier. valuen optional initial value of the variable. it can be any legal expression. default value is undefined. description var declarations, wherever they occur, are processed before any code is executed. this is called hoisting, and is discussed further below. ...
...or, even in strict mode, and the variable will not lose its value, unless another assignment is performed. 'use strict'; function foo() { var x = 1; function bar() { var y = 2; console.log(x); // 1 (function `bar` closes over `x`) console.log(y); // 2 (`y` is in scope) } bar(); console.log(x); // 1 (`x` is in scope) console.log(y); // referenceerror in strict mode, `y` is scoped to `bar` } foo(); variables declared using var are created before any code is executed in a process known as hoisting. their initial value is undefined. 'use strict'; console.log(x); // undefined (note: not referenceerror) console.log('still going...'); // still going... var x = 1; console.log(x); // 1 console.log('still going...'); // still going... in the glob...
...ould make no sense to be able to use the delete operator on a global variable. 'use strict'; var x = 1; globalthis.hasownproperty('x'); // true delete globalthis.x; // typeerror in strict mode. fails silently otherwise. delete x; // syntaxerror in strict mode. fails silently otherwise. note that in both nodejs commonjs modules and native ecmascript modules, top-level variable declarations are scoped to the module, and are not, therefore added as properties to the global object. unqualified identifier assignments the global object sits at the top of the scope chain. when attempting to resolve a name to a value, the scope chain is searched. this means that properties on the global object are conveniently visible from every scope, without having to qualify the names with globalthis. or window...
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Storage access policy: Block cookies from trackers
ly restrict third-party storage access for resources that are not classified as tracking resources. we may choose to apply additional restrictions to third-party storage access in the future. the restrictions applied by the policy will not prevent third-party scripts classified as tracking resources from accessing storage in the main context of the page. these scripts can continue to use storage scoped to the top-level origin. origins classified as trackers will have access to their own storage when they are loaded in a first-party context. cross-origin resources loaded from the same etld+1 as the top-level context will still have access to their storage. origins normally classified as trackers will not be blocked if the top-level page origin is determined to be from the same organization as...
...aded from the same etld+1 as the top-level context will still have access to their storage. origins normally classified as trackers will not be blocked if the top-level page origin is determined to be from the same organization as them. storage access grants in order to improve web compatibility and permit third-party integrations that require storage access, firefox will grant storage access scoped to the first party for a particular third-party origin as described in this section. currently, firefox includes some web compatibility heuristics that grant storage access to third-party resources classified as trackers when a user interacts with those third parties. we do this when we expect that not granting access would cause the web page to break. we also support an initial implementation of...
... short-lived storage access on the non-tracking origin and any other non-tracking origins that appear further down the redirect chain (i.e., if the load continues to redirect). the tracking origin must have received user interaction as a first party within the past 30 days, and the storage access permission expires after 15 minutes. scope of storage access when storage access is granted, it is scoped to the origin of the opener document or subdomains of that origin. access that is granted on the subdomain of an origin does not extend to the top-level origin. as an example, if a resource from tracker.example is granted storage access on foo.example.com, then tracker.example will be able to access its cookies on bar.foo.example.com but not example.com. instead, if tracker.example were granted a...
...ing identifiers does not prevent the display of advertisements. i use a third-party analytics service that is classified as a tracker. will i still receive analytics data? this depends on how the third-party analytics service is implemented. third-party analytics providers will no longer be able to user their third-party storage to collect data. this means that providers using cookies which are scoped to their third-party domain, or local storage and other site data stored under their origin, will no longer have access to those identifiers across other websites. if these services are embedded into the main context of the page, they can continue to use first-party cookies and site storage to track users across page visits on that specific first-party domain. i use third-party services for soc...

Getting started with Svelte - Learn web development
nds it to the body of our html page. public: this directory contains all the files that will be published in production. favicon.png: this is the favicon for your app. currently, it's the svelte logo. index.html: this is the main page of your app. initially it's just an empty html5 page that loads the css files and js bundles generated by svelte. global.css: this file contains unscoped styles. it's a regular css file that will be applied to the whole application. build: this folder contains the generated css and javascript source code. bundle.css: the css file that svelte generated from the styles defined for each component. bundle.js: the javascript file compiled from all your javascript source code. having a look at our first svelte component...
... max-width: 240px; margin: 0 auto; } h1 { color: #ff3e00; text-transform: uppercase; font-size: 4em; font-weight: 100; } @media (min-width: 640px) { main { max-width: none; } } </style> we are applying a style to our <h1> element. what will happen other components with <h1> elements in them? in svelte, css inside a component's <style> block will be scoped only to that component. this works by adding a class to selected elements, which is based on a hash of the component styles. you can see this in action by opening localhost:5000 in a new browser tab, right/ctrl-clicking on the hello world! label, and choosing inspect: when compiling the app, svelte changes our h1 styles definition to h1.svelte-1tky8bj, and then modifies every <h1> element in ...
...we'll start building our first proper application — a todo list. before we do that, however, let's recap some of the things we’ve learned. in svelte: we define the script, style and markup of each component in a single .svelte file. component props are declared with the export keyword. svelte components can be used just by importing the corresponding .svelte file. components styles are scoped, keeping them from clashing with each other. in the markup section you can include any javascript expression by putting it between curly braces. the top-level variables of a component constitute its state. reactivity is fired just by assigning a new value to a top level variable. previous overview: client-side javascript frameworks next in this module introduction to client-side ...

Index - Web APIs
ser compatibility for details. 1239 event.cancelable api, dom, dom reference, event, property, read-only, reference the cancelable read-only property of the event interface indicates whether the event can be canceled, and therefore prevented as if the event never happened. 1240 event.composed api, event, property, read-only, reference, web components, composed, scoped, shadow dom the read-only composed property of the event interface returns a boolean which indicates whether or not the event will propagate across the shadow dom boundary into the standard dom. 1241 event.composedpath() api, event, method, reference, web components, composedpath, events, shadow dom the composedpath() method of the event interface returns the event’s ...
... the htmlstyleelement interface represents a <style> element. it inherits properties and methods from its parent, htmlelement, and from linkstyle. 1903 htmlstyleelement.media api, html dom, htmlstyleelement, needsmarkupwork, property, reference the htmlstyleelement.media property specifies the intended destination medium for style information. 1904 htmlstyleelement.scoped api, html dom, htmlstyleelement, non-standard, obsolete, property, reference, scoped the htmlstyleelement.scoped property is a boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true). 1905 htmlstyleelement.type api, html dom, htmlstyleelement, needsmarkupwork, needsspectable, property, read-only the htmls...
...tal, method, notifications, reference, service workers, service worker api, serviceworker, serviceworkerregistration, getnotifications the getnotifications() method of the serviceworkerregistration interface returns a list of the notifications in the order that they were created from the current origin via the current service worker registration. origins can have many active but differently-scoped service worker registrations. notifications created by one service worker on the same origin will not be available to other active services workers on that same origin. 3982 serviceworkerregistration.installing api, installing, property, reference, référence(2), service workers, serviceworkerregistration the installing property of the serviceworkerregistration interface ret...

CSS Containment - CSS: Cascading Style Sheets
es you a nice way to explain to the browser this fact, and allow it to make performance optimizations based on that knowledge. key concepts and terminology this specification defines only one property, the contain property. the values for this property indicate the type of containment that you want to apply to that element. ...
... in addition: float layout will be performed independently. ...
... children cannot affect the size of the element itself — its size is computed as if it had no children. if you turn on contain: size you need to also specify the size of the element you have applied this to. it will end up being zero-sized in most cases, if you don't manually give it a size. style containment article { contain: style; } despite the name, style containment does not provide scoped styles such as you would get with the shadow dom. the main use case is to prevent situations where a css counter could be changed in an element, which could then affect the rest of the tree. using contain: style would ensure that the counter-increment and counter-set properties created new counters scoped to that subtree only. note: style containment is "at-risk" in the spec and may not be su...

const - JavaScript
the value of a constant can't be changed through reassignment, and it can't be redeclared. the source for this interactive example is stored in a github repository. if you'd like to contribute to the interactive examples project, please clone https://github.com/mdn/interactive-examples and send us a pull request. syntax const name1 = value1 [, name2 = value2 [, ... [, namen = valuen]]]; namen the constant's name, which can be any legal identifier. valuen the constant's value. this can be any legal expression, including a function expression. description this declaration creates a constant whose scope can be either global or local to the block in which it is declared. ...
...ing to redeclare a constant throws an error // uncaught syntaxerror: identifier 'my_fav' has already been declared const my_fav = 20; // the name my_fav is reserved for constant above, so this will fail too var my_fav = 20; // this throws an error too let my_fav = 20; block scoping it's important to note the nature of block scoping. ...
...ier 'my_fav' has already been declared const my_fav = 20; // the name my_fav is reserved for constant above, so this will fail too var my_fav = 20; // this throws an error too let my_fav = 20; block scoping it's important to note the nature of block scoping. ...

Index
g can't be encoded as bytes. if the returned value is greater than the length you specified, the string was truncated. 253 js_entercompartment jsapi reference, spidermonkey no summary! 254 js_entercrosscompartmentcall jsapi reference, obsolete, spidermonkey no summary! 255 js_enterlocalrootscope jsapi reference, obsolete, spidermonkey scoped local root management allows native functions, getter/setters, etc. to avoid calling js_addroot and js_removeroot to manage global roots temporarily. 256 js_enumerate jsapi reference, spidermonkey js_enumerate gets the ids of all own properties of the specified object, obj, that have the jsprop_enumerate attribute. (the term own property refers to a property that is not inher...
...stead. 271 js_flattenstring jsapi, jsapi reference, reference, référence(2), spidermonkey js_flattenstring flattens a string str and returns a pointer to jsflatstring. 272 js_flushcaches jsapi reference, needscontent, spidermonkey . 273 js_forgetlocalroot jsapi reference, obsolete, spidermonkey this function is used to interact with scoped local root management. see js_enterlocalrootscope for more on this topic. 274 js_forwardgetpropertyto jsapi reference, reference, référence(2), spidermonkey js_forwardgetpropertyto is the base implementation of js_getproperty, js_getucproperty, js_getpropertybyid etc, where onbehalfof is same to obj. 275 js_freezeobject jsapi reference, reference, référence...

HTMLStyleElement - Web APIs
tion medium for style information. htmlstyleelement.type is a domstring representing the type of style being applied by this statement. htmlstyleelement.disabled is a boolean value representing whether or not the stylesheet is disabled (true) or not (false). linkstyle.sheet read only returns the stylesheet object associated with the given element, or null if there is none htmlstyleelement.scoped is a boolean value indicating if the element applies to the whole document (false) or only to the parent's sub-tree (true). methods no specific method; inherits properties from its parent, htmlelement, and linkstyle. specifications specification status comment html living standardthe definition of 'htmlstyleelement' in that specification. living standard ...
...cations specification status comment html living standardthe definition of 'htmlstyleelement' in that specification. living standard html 5.1the definition of 'htmlstyleelement' in that specification. recommendation html5the definition of 'htmlstyleelement' in that specification. recommendation the following property has been added: scoped. document object model (dom) level 2 html specificationthe definition of 'htmlstyleelement' in that specification. obsolete added a second inheritence, the linkstyle interface. document object model (dom) level 1 specificationthe definition of 'htmlstyleelement' in that specification. obsolete initial definition ...

WebGL best practices - Web APIs
n shaders, and you need it to have 32-bits, you must use highp or you will have portability problems. ...
... while you can use mediump float instead, but be aware that this often results in corrupted re...

<style>: The Style Information element - HTML: Hypertext Markup Language
ce a cryptographic nonce (number used once) used to whitelist inline styles in a style-src content-security-policy. the server must generate a unique nonce value each time it transmits a policy. it is critical to provide a nonce that cannot be guessed as bypassing a resource’s policy is otherwise trivial. title this attribute specifies alternative style sheet sets. deprecated attributes scoped this attribute specifies that the styles only apply to the elements of its parent(s) and children. this attribute may be re-introduced in the future per https://github.com/w3c/csswg-drafts/issues/3547. if you want to use the attribute now, you can use a polyfill. examples a simple stylesheet in the following example, we apply a very simple stylesheet to a document: <!doctype h...
... permitted content text content matching the type attribute, that is text/css. tag omission neither tag is omissible. permitted parents any element that accepts metadata content. implicit aria role no corresponding role permitted aria roles no role permitted dom interface htmlstyleelement ...

Control flow and error handling - JavaScript
ited by a pair of curly brackets: { statement_1; statement_2; ⋮ statement_n; } example block statements are commonly used with control flow statements (if, for, while). while (x < 10) { x++; } here, { x++; } is the block statement. important: javascript before ecmascript2015 (6th edition) does not have block scope! in older javascript, variables introduced within a block are scoped to the containing function or script, and the effects of setting them persist beyond the block itself. in other words, block statements do not define a scope. "standalone" blocks in javascript can produce completely different results from what they would produce in c or java. for example: var x = 1; { var x = 2; } console.log(x); // outputs 2 this outputs 2 because the var x statement withi...
...completely different results from what they would produce in c or java. for example: var x = 1; { var x = 2; } console.log(x); // outputs 2 this outputs 2 because the var x statement within the block is in the same scope as the var x statement before the block. (in c or java, the equivalent code would have outputted 1.) since ecmascript2015, the let and const variable declarations are block-scoped. see the let and const reference pages for more information. conditional statements a conditional statement is a set of commands that executes if a specified condition is true. javascript supports two conditional statements: if...else and switch. if...else statement use the if statement to execute a statement if a logical condition is true. use the optional else clause to execute a statement...