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According to Mozilla, there is no browser on iOS supporting the cross-origin-opener-policy, which is one of the security requirements for enabling a SharedArrayBuffer. Does this mean I cannot use a SharedArrayBuffer for any web-application on the iOS platform?

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6 Answers 6

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actually it says on the Caniuse site that you can enable the feature, but I have found no documentation to this end re: Safari

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Nice catch! I had missed that detail.
I was hoping to use opencv.js, but this blocked me on Safari on both mac os and iOS and I haven't found any way to enable that feature.
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Unfortunately SharedArrayBuffer was disabled due to Spectre / Meltdown issues, so no, you cannot use it:

https://caniuse.com/#feat=sharedarraybuffer

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Yes, I noticed that, yet hoped there was some special set of requirements that made it possible, as has been done with other platforms. Hopefully, this issue will be rectified soon.
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There's a flag you can enable now in Safari:

Resurrected SharedArrayBuffer and Atomics behind a flag (JSC_useSharedArrayBuffer=1) (r269531)

https://trac.webkit.org/changeset/269531/webkit/

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Can you please specify how this flag can be used?
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To complete user3325025 and Alexander's answer, you can open Safari with SharedArrayBuffer enabled by typing the following command in the terminal:

__XPC_JSC_useSharedArrayBuffer=1 open -a "Safari"

Here is a list of browsers that support SharedArrayBuffer: https://caniuse.com/sharedarraybuffer

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If the user has upgraded to Safari 15.2, SharedArrayBuffer can be enabled with COOP and COEP headers. See this documentation page.

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While this link may answer the question, it is better to include the essential parts of the answer here and provide the link for reference. Link-only answers can become invalid if the linked page changes. - From Review
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Safari Technology Preview recently announced it can enable SharedArrayBuffer when the page is cross-origin isolated. https://webkit.org/blog/11975/release-notes-for-safari-technology-preview-133/

There are certain requirements to enable cross-origin isolation. Learn more here: https://web.dev/coop-coep/

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