Firefox 149 adds CSS attr(type(<x>)) behind pref#29186
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attr(type(<x>)) behind pref
caugner
approved these changes
Mar 13, 2026
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Summary
attr(x type(<types>))attr(x type(<url>))as it is not supported in any browserTest results and supporting details
attr(x type(<types>))using the the CodePens in this collection in the following Firefox Browsers with thelayout.css.attr.enabledflag:attr(x type(<url>))with this Codepen in these browsers and all failed:Related issues