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
   HTML Living Standard
The 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.
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 
ExperimentalNon-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
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