The [Safari 16.4 beta release notes](https://developer.apple.com/documentation/safari-release-notes/safari-16_4-release-notes) indicate that it will also support these keys.
Bug 1743582 Comment 5 Edit History
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The [Safari 16.4 beta release notes](https://developer.apple.com/documentation/safari-release-notes/safari-16_4-release-notes) indicate that it will also support importing these keys.