Web/API/WindowOrWorkerGlobalScope/crossOriginIsolated

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

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.

This value is dependant on any Cross-Origin-Opener-Policy and Cross-Origin-Embedder-Policy headers present in the response.

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.	Living Standard	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
crossOriginIsolated Experimental'Non-standard'	Chrome No support No	Edge No support No	Firefox Full support 72	IE No support No	Opera No support No	Safari No support No	WebView Android No support No	Chrome Android No support No	Firefox Android No support No	Opera Android No support No	Safari iOS No support No	Samsung Internet Android No support No

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

Non-standard. Expect poor cross-browser support.'

Non-standard. Expect poor cross-browser support.

See also

• Service Workers
• Web Workers

WindowOrWorkerGlobalScope.crossOriginIsolated by Mozilla Contributors is licensed under CC-BY-SA 2.5.