WindowOrWorkerGlobalScope.crossOriginIsolated - Web APIs
the crossoriginisolated read-only property of the windoworworkerglobalscope interface returns a boolean value that indicates whether a sharedarraybuffer can be sent via a window.postmessage() call.
... syntax var mycrossoriginisolated = self.crossoriginisolated; // or just crossoriginisolated value a boolean value examples if(crossoriginisolated) { // post sharedarraybuffer } else { // do something else } specifications specification status comment html living standardthe definition of 'crossoriginisolated' in that specification.

MediaStreamTrack - Web APIs
mediastreamtrack.isolated read only returns a boolean value which is true if the track is isolated; that is, the track cannot be accessed by the document that owns the mediastreamtrack.
... isolationchange sent whenever the value of the isolated property changes due to the document gaining or losing permission to access the track.
... specifications specification status comment identity for webrtcthe definition of 'isolated tracks' in that specification.
... candidate recommendation additional properties for isolated track support media capture and streamsthe definition of 'mediastreamtrack' in that specification.

Components.utils.Sandbox
passing a content window object, setting wantxrays:true (default) and using an extended principal provides a clean, isolated execution environment in which javascript code that needs web apis (such as accessing the window's dom) can be executed without interference from untrusted content code.
...true provides a safer, isolated context.

Virtualenv
virtualenv tools virtualenv does one thing well: creates isolated virtual environments of python packages.
...here are a few such tools: carton: make a self-extracting virtualenv from directories or urls of packages; http://pypi.python.org/pypi/carton velcro: a script that sets up a python project for local installation; https://bitbucket.org/kumar303/velcro/ virtualenvwrapper: a set of extensions to ian bicking’s virtualenv tool for creating isolated python development environments; http://www.doughellmann.com/projects...tualenvwrapper the mozilla-central virtualenv in order to make use of various python modules located throughout mozilla-central, a virtualenv is created as part of the build process: http://mxr.mozilla.org/mozilla-central/source/js/src/build/autoconf/python-virtualenv.m4 .

MediaStreamConstraints - Web APIs
streams isolated in this way can only be displayed in a media element (<audio> or <video>) where the content is protected just as if cors cross-origin rules were in effect.
... when a peer identity is set, mediastreamtracks from that peer have their isolated flag set to true.

RTCPeerConnection - Web APIs
isolationchange sent to the rtcpeerconnection when the isolated property on one of the mediastreamtrack objects associated with the connection changes value.
... a track is isolated if its content cannot be accessed by the owning document due to lack of authentication or if the track comes from a cross-origin source.

window.postMessage() - Web APIs
secure shared memory messaging if postmessage() throws when used with sharedarraybuffer objects, you might need to make sure you cross-site isolated your site properly.
...is gated behind two http headers: cross-origin-opener-policy with same-origin as value (protects your origin from attackers) cross-origin-embedder-policy with require-corp as value (protects victims from your origin) cross-origin-opener-policy: same-origin cross-origin-embedder-policy: require-corp to check if cross origin isolation has been successful, you can test against the crossoriginisolated property available to window and worker contexts: if (crossoriginisolated) { // post sharedarraybuffer } else { // do something else } see also planned changes to shared memory which is starting to roll out to browsers (firefox 79, for example).

Planned changes to shared memory - JavaScript
to avoid having to check whether postmessage() throws, self.crossoriginisolated is being standardized (a getter that returns a boolean; true if the headers are set), available in window and worker contexts.
... postmessage() changes and self.crossoriginisolated: whatwg/html issue #4732, whatwg/html issue #4872, draft specification.

arabic-form - SVG: Scalable Vector Graphics
only one element is using this attribute: <glyph> context notes value initial | medial | terminal | isolated default value isolated animatable no initial this value indicates that the glyph represents the initial form.
... isolated this value indicates that the glyph represents the isolated form.

/loader - Archive of obsolete content
secure each module in an isolated js sandbox and makes any capability imports explicit via calls to the require() function.

Appendix D: Loading Scripts - Archive of obsolete content
javascript modules can therefor be used for communication and data sharing between otherwise isolated contexts.

Setting up an extension development environment - Archive of obsolete content
however, you won't enjoy the benefits of isolated resources, which we discussed earlier.

MMgc - Archive of obsolete content
in practice this means: setting a property on an object to another object (creating an arch in the reachabilty graph) native code that writes a pointer to a gc object into another gc object writing an object to a gc root 1 and 2 are pretty well isolated.

XPJS Components Proposal - Archive of obsolete content
the xpconnectcomponents object allows access to the whole repository of native and js xpcom components, so this is not as isolated an environment as it might at first sound.

The Joy of XUL - Archive of obsolete content
while such changes are extensive and affect most (if not all) of the application, they are also isolated from one another, enabling the core xul definition and application logic to be shared among all of the custom versions.