Bug 1591892 Comment 0 Edit History

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Original comment by
on 
In order to make it easier for developers to figure out if `postMessage()` will throw, we should expose that information through `self.crossOriginIsolated`, as defined by https://github.com/whatwg/html/pull/4734.

I'll work on adding some tests.
Revision 1 by
on 
In order to make it easier for developers to figure out if `postMessage()` will throw, we should expose that information through `self.crossOriginIsolated`, as defined by https://github.com/whatwg/html/pull/4734.

I'll work on adding some tests.

I think we should have this when COOP and COEP are enabled and it should only return true if dom.postMessage.sharedArrayBuffer.withCOOP_COEP is also enabled and the COOP and COEP headers are set appropriately.

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