[Gecko Bug 1999972] Add 'none' keyword to CSS position-anchor property, and make it the initial value. #56024
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…nitial value. Differential Revision: https://phabricator.services.mozilla.com/D272521 bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1999972 gecko-commit: 7f71662cdea5d6de048d7e586b6a0b5306cb6670 gecko-reviewers: firefox-style-system-reviewers, layout-reviewers, emilio
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Differential Revision: https://phabricator.services.mozilla.com/D272521
bugzilla-url: https://bugzilla.mozilla.org/show_bug.cgi?id=1999972
gecko-commit: 7f71662cdea5d6de048d7e586b6a0b5306cb6670
gecko-reviewers: firefox-style-system-reviewers, layout-reviewers, emilio