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Re: [csswg-drafts] [css-cascade][css-selectors][css-pseudo-elements] How does 'inherit' keyword behave in a child of ::first-line?

From: François REMY via GitHub <sysbot+gh@w3.org>
Date: Mon, 20 Mar 2017 17:29:18 +0000
To: public-css-archive@w3.org
Message-ID: <issue_comment.created-287835484-1490030956-sysbot+gh@w3.org>
Nope, I didn't say the first-line pseudo element is moved inside the span; technically we do no even have any ::first-line box in our browser (the only caveat being the background which is drawn as part of a special logic).

What I said is that in Edge/Firefox only the text runs' styles are computed based on the style of the ::first-line pseudo-element of the parent block. I meant to say that "only the style of elements that are generated during layout can depend on the style of pseudo-elements, and the span is not such a thing".

I hadn't considered however the possibility of saying the span had fragments, which themselves are layout constructs and could inherit from the first-line pseudo at run-time... In that case I can see how you would expect background to inherit. Looking at our code, this is what we actually do, so I guess our behavior needs some more explanation than just "only layout constructs can have weird styles"...

The correct explaination is that in Edge (and apparently Firefox too) we have this concept of render style which applies to text only, and which is the mechanism we use to transfer ::first-line styles vs other styles. That is why background does not inherit from the ::first-line even though it can be defined on the ::first-line: because it is not a text property (we do have a character-level background for selections etc, but this is another, internal-only property).

The fact Chrome inherits the border is a bug though. Like the spec mentions, only properties that apply on the first line are supposed to propagate to the layout-generated boxes. Maybe to match Edge and Firefox we should update the spec and create the concept of "text styles" and specify that only "text styles properties" inherit from ::first-line to its content.

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Received on Monday, 20 March 2017 17:29:27 UTC

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