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[css-color] Should specify that `opacity` is serialized as a number for the specified values · Issue #10426 · w3c/csswg-drafts · GitHub
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The opacity property has a quirk implemented in at least Safari, Firefox and Chrome and tested in css/css-color/parsing/opacity-valid.html, that when the specified value is a percentage, it should be serialized as a normalized number.
This should be formalized in the opacity section of CSS Color.
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