See: - https://wpt.fyi/results/css/css-conditional/css-supports-036.xht?label=master&label=experimental&aligned&q=css%2Fcss-conditional%2F%20safari%3Afail%20firefox%3Apass%20chrome%3Apass - https://wpt.fyi/results/css/css-conditional/js/supports-conditionText.html?label=master&label=experimental&aligned&q=css%2Fcss-conditional%2F%20safari%3Afail%20firefox%3Apass%20chrome%3Apass Unknown functions should be parsable and evaluate to unsupported.
<rdar://problem/107397723>
Pull request: https://github.com/WebKit/WebKit/pull/12155
Committed 262308@main (4726444d4de9): <https://commits.webkit.org/262308@main> Reviewed commits have been landed. Closing PR #12155 and removing active labels.