Bug 250506 – Update whitespace expectations for custom properties to match CSS Syntax Level 3 in some WPTs

• Status: RESOLVED
• Resolution: FIXED
• Component: CSS

[Antti Koivisto]

Tokenisation and parsing for whitespaces described in CSS Syntax Module Level 3 matches the current WebKit behavior in custom properties.
Some WPTs still have wrong expectations.

Both leading and trailing whitespaces should be stripped:

https://drafts.csswg.org/css-syntax/#consume-declaration

    2. While the next input token is a <whitespace-token>, consume the next input token.
    ...
    7. While the last token in decl’s value is a <whitespace-token>, remove that token."

Middle whitespaces collapse to a single <whitespace-token>:

https://drafts.csswg.org/css-syntax/#consume-token

    whitespace
    Consume as much whitespace as possible. Return a <whitespace-token>.

[Radar WebKit Bug Importer]

<rdar://problem/104162464>

[Antti Koivisto]

Pull request: https://github.com/WebKit/WebKit/pull/8573

[Antti Koivisto]

Submitted web-platform-tests pull request: https://github.com/web-platform-tests/wpt/pull/37923

[EWS]

Committed 258866@main (7a3b462e1d00): <https://commits.webkit.org/258866@main>

Reviewed commits have been landed. Closing PR #8573 and removing active labels.