CSS3’s attr() doesn’t work in major browsers

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Looking at the grammar that’s given in the spec:

attr( <attr-name> <type-or-unit>? [ , <fallback> ]? )

It looks like the comma between the attribute name and the unit to be used needs to be dropped:

.window > .content .wbutton.tint {
    border: solid thin attr(data-tint color);
    box-shadow: inset 0 0 50px attr(data-tint color);
}

However, even if you have the right syntax, it won’t work either. It turns out, there are no known implementations of the level 3 version of attr() as of 2012…2020. To make matters worse, it’s still at-risk as of the latest editor’s draft of the spec.

But not all is lost: if you’d like to see this feature implemented in upcoming browsers, there is still time to suggest it in the relevant feedback channels! Here are the proposals that have been put out so far:

For the record, the basic Level 2.1 version is fully supported across recent versions of all major browsers, including IE8+ and Firefox 2+, and is used with the content property for the :before and :after pseudo-elements for generated content. The MDN browser compatibility table is applicable only to this version, and not the CSS3 version.

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