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feat(css): update computed for border/column-rule/outline-width, outline-offset#1069

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sb3nder wants to merge 2 commits into
mdn:mainfrom
sb3nder:computed-border-width
Open

feat(css): update computed for border/column-rule/outline-width, outline-offset#1069
sb3nder wants to merge 2 commits into
mdn:mainfrom
sb3nder:computed-border-width

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@sb3nder

@sb3nder sb3nder commented May 9, 2026

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Description

This PR updates the computed value for border-*-width, column-rule-width, outline-width, outline-offset, -webkit-border-*-width, to "the absolute length, snapped as a line width".

Motivation

Additional details

border-*-width, column-rule-width, outline-width snapped as a line width:
w3c/csswg-drafts#5210

Computed value untangled from *-style properties value:
w3c/csswg-drafts#11494 (comment)

outline-offset snapped as a line width:
w3c/csswg-drafts#12906

Definition of "length snapped as a line width":
https://drafts.csswg.org/css-values-4/#snap-as-a-line-width

Related issues and pull requests

Depends on: mdn/content#44193

@sb3nder sb3nder changed the title feat(css): Update computed for border/column-rule/outline-width, outline-offset May 19, 2026
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