Intent to Prototype: Background layer count independence

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Sep 4, 2026, 2:31:02 AMSep 4
to blin...@chromium.org, jfern...@igalia.com
Contact emails
jfern...@igalia.com

Specification
https://drafts.csswg.org/css-values-4/#linked-properties

Summary
Makes the computed value of the background-* longhands keep the number of comma-separated values the author specified, instead of repeating or truncating it to the background-image layer count. Repeating and truncating are used-value behavior: "The computed values of the coordinating list properties are not affected by such truncation or repetition." This feature would implement the behavior defined in the https://drafts.csswg.org/css-values-4/ Appendix A.

Blink component
Blink>CSS

Web Feature ID
background

Motivation
The behavior defined in the "Appendix A: Coordinating List-Valued Properties" of the CSS Values And Units L4 specification has been discussed recently and agreed that it should stand. This makes Chrome the only browser diverging in the specified behavior.

Initial public proposal
No information provided

Goals for experimentation
None

Requires code in //chrome?
False

Tracking bug
https://issues.chromium.org/issues/40855581

Estimated milestones

No milestones specified



Link to entry on the Chrome Platform Status
https://chromestatus.com/feature/5144333908049920?gate=5128960945029120

This intent message was generated by Chrome Platform Status.
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