[csswg-drafts] Pull Request: [cssom-1] Append only one newline in @media rule block

cdoublev has just submitted a new pull request for https://github.com/w3c/csswg-drafts:

== [cssom-1] Append only one newline in @media rule block ==
The [current algorithm](https://drafts.csswg.org/cssom-1/#serialize-a-css-rule) definition requires adding two newlines:

  > 3. A single SPACE (U+0020), followed by the string "{", i.e., LEFT CURLY BRACKET (U+007B), followed by **a newline**.
  > 4. The result of performing serialize a CSS rule on each rule in the rule’s cssRules list, filtering out empty strings, indenting each item with two spaces, all joined with newline.
  > 5. **A newline**, followed by the string "}", i.e., RIGHT CURLY BRACKET (U+007D)

Based on [WPT tests](https://github.com/web-platform-tests/wpt/blob/master/css/cssom/serialize-media-rule.html) and the [original commit](https://github.com/w3c/csswg-drafts/pull/728) of the current version, I think this is an obvious bugfix.

See https://github.com/w3c/csswg-drafts/pull/13386


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Received on Friday, 23 January 2026 06:45:05 UTC