FF144 CSSStyleProperties CSS2Properties #27975
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hamishwillee
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Sep 26, 2025
| "chrome_android": "mirror", | ||
| "edge": "mirror", | ||
| "firefox": { | ||
| "version_added": false |
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Checking if this should be true in https://bugzilla.mozilla.org/show_bug.cgi?id=1989925#c4 - but assuming not.
hamishwillee
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Sep 26, 2025
| "opera": "mirror", | ||
| "opera_android": "mirror", | ||
| "safari": { | ||
| "version_added": "26" |
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This is an assumption - but it is a reasonable assumption.
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FF144 added support for
CSSStylePropertiesin https://bugzilla.mozilla.org/show_bug.cgi?id=1919582 , as updated in #27902However as explained in https://bugzilla.mozilla.org/show_bug.cgi?id=1919582#c30 the
CSSStylePropertieswas renamed from a preexistingCSS2Properties. This adds the alternative name to the feature for Firefox. Note that the developer indicates this was from version 2 (checked) but might have been version 1.FF145 added support for returning this from
.stylein elements (HTML, SVG, MathML) and also ingetComputedStyle()in https://bugzilla.mozilla.org/show_bug.cgi?id=1989925. I have set these to have a subfeature indicating the new return type.It is not clear if FF returns it from
CSSStyleRule.style- I am asking in https://bugzilla.mozilla.org/show_bug.cgi?id=1989925#c4Chrome hasn't added support for
CSSStylePropertiesas far as I can tell.Safari has been marked as supporting
CSSStylePropertiesin 26 already, but the return methods were not marked. I have set all of them to working in that version though I have not tested it (they should be).In addition, the spec changed to move the
cssFloatattribute fromCSSStyleDeclarationtoCSSStyleProperties. This won't affect FF which never implemented that, but it does affect Safari. So I've marked it as removed and also now non-standard and deprecated.Related docs work can be tracked in mdn/content#41133