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[css-borders-4] Clarify how border-shape renders box-shadow. #13021

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Oct 27, 2025
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[css-borders-4] Clarify how border-shape renders box-shadow. #13021

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3 changes: 2 additions & 1 deletion css-borders-4/Overview.bs
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Expand Up @@ -3079,7 +3079,8 @@ When an element's [=computed value=] of 'border-shape' is not <css>none</css>,
its 'border-radius' is ignored, as if it was set to 0.
'corner-shape' is implicitly ignored, as it can only work in tandem with 'border-radius'.

A 'box-shadow' follows both the outer border path.
An [=outer box-shadow=] follows the outside of the outer path, and an [=inner box-shadow=] follows the inside inner path.
Both are rendered as a stroke, with a stroke width of <code>spread * 2</code>, clipped by the border shape.

'border-shape' does not affect geometry or layout,
which is still computed using the existing 'border-width' properties.
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