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[css-borders-4] Update box-shadow interaction with border-shape #13730

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Merged
danielsakhapov merged 1 commit into from
Mar 26, 2026
Merged

[css-borders-4] Update box-shadow interaction with border-shape #13730

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8 changes: 4 additions & 4 deletions css-borders-4/Overview.bs
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Expand Up @@ -3347,10 +3347,10 @@ Interaction with 'border-radius' and 'corner-shape'</h4>
<h4 id="border-shape-shadow-interaction">
Interaction with 'box-shadow'</h4>

An [=outer box-shadow=] follows the outside of the outer path,
and an [=inner box-shadow=] follows the inside of the inner path.
Both are rendered as a stroke, with a stroke width of <code>spread * 2</code>,
clipped by the border shape.
An [=outer box-shadow=] is cast as if the shape defined by the outer path were opaque.
An [=inner box-shadow=] is cast as if everything outside the shape defined by the inner path were opaque.
For both inner and outer shadows, the shadow shape is expanded or contracted by the spread distance,
blurred by the blur radius, and then clipped by the 'border-shape', adhering to the standard 'box-shadow' painting rules.

<div class="example">
<pre class=lang-css>
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