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https://drafts.csswg.org/cssom/#terminology [[ The term supported CSS property refers to a CSS property that the user agent implements, and that is defined to be a case-insensitive property in the CSS specification. ]] See https://bugzilla.mozilla.org/show_bug.cgi?id=1246796#c7 I wanted to exclude custom properties, but include vendor-specific properties. Should change the text to make it actually do that, and add a note clarifying the intent.
https://github.com/w3c/csswg-drafts/commit/e2f369bdd8569e7e34910fe8dbaf2aa2920bdaa2