[csswg-drafts] [css-syntax] what a whitespace character is (#3590)

tabatkins has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-syntax] what a whitespace character is ==
(migrated from the mailing list)

**fantasai said:**
> On 08/24/2015 06:22 AM, L. David Baron wrote:
> >
> > I think that:
> >
> >   (a) we should have interop on the ::first-letter whitespace
> >       skipping characters, and it should be specified
> >
> >   (b) ::blank, or whatever we call it, should use the same definition
> >       of whitespace, since I don't want two definitions of "text
> >       that's only whitespace" in selectors
> >
> > It might also be worth a slightly closer examination of what other
> > things should have a common behavior with this.  (Might other
> > browsers use the same function for ::first-letter and other things
> > that are present in Web standards?)
> 
> Sounds reasonable to me. I think historically CSS syntactic white space
> and CSS collapsible white space have differed on handling form feed:
>    http://www.w3.org/TR/CSS2/syndata.html#tokenization (incl. form feed)
>    http://www.w3.org/TR/CSS2/text.html#white-space-prop (no form feed)
> 
> But I think this is an error, since even HTML4 includes form feed
> where it defines white space collapsing:
>    http://www.w3.org/TR/html4/struct/text.html#h-9.1
> 
> I think we should align on the set
>    U+0020 SPACE
>    U+0009 CHARACTER TABULATION (tab)
>    U+000A LINE FEED (LF)
>    U+000C FORM FEED (FF)
>    U+000D CARRIAGE RETURN (CR)
> since, with the exception of the white space collapsing section, both
> the CSS2+ and HTML4+ specs (and Gecko) agree on this definition.
>    http://www.w3.org/TR/CSS2/syndata.html#tokenization
>    http://www.w3.org/TR/css-syntax-3/#input-preprocessing
>    http://www.w3.org/TR/html4/struct/text.html#h-9.1
>    https://html.spec.whatwg.org/multipage/infrastructure.html#space-character

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Received on Friday, 1 February 2019 23:16:07 UTC