Posted a [site compatibility note](https://www.fxsitecompat.dev/en-CA/docs/2020/read-only-and-read-write-pseudo-classes-have-been-unprefixed/) for this.
Bug 312971 Comment 48 Edit History
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Posted a [site compatibility note](https://www.fxsitecompat.dev/docs/2020/read-only-and-read-write-pseudo-classes-have-been-unprefixed/) for this. Also updated our [compatibility checker](https://addons.mozilla.org/firefox/addon/site-compatibility-tools/) to inform the deprecation.