[css-background-3] Adjust border-radius outset correction #12896
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The new adjustment makes the radius reduction factor in the minimum radius percentage of the corner, making it less pronounced the closer the corner's border-radius gets to 50%. Closes w3c#7103 Resolution: w3c#7103 (comment)
noamr
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Loirooriol
reviewed
Oct 4, 2025
css-backgrounds-3/Overview.bs
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| To compute the <dfn>adjusted radius dimension</dfn> given numbers |coverage|, |radius|, and |outset|: | ||
| 1. If |radius| is greater than |spread|, or if |coverage| is greater than 1, then return <code>|radius| + |outset|</code>. | ||
| 1. Let |ratio| be <code>1 - |radius| / |outset|</code>. | ||
| 1. Return <code>|radius| + |outset| * (1 - r<sup>3</sup> * (1 - |coverage|<sup>3</sup>))</code>. |
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| 1. Return <code>|radius| + |outset| * (1 - r<sup>3</sup> * (1 - |coverage|<sup>3</sup>))</code>. | |
| 1. Return <code>|radius| + |outset| * (1 - |ratio|<sup>3</sup> * (1 - |coverage|<sup>3</sup>))</code>. |
Or actually it's not really a ratio, maybe ratio should just be |radius| / |outset| and here (1 - |ratio|)<sup>3</sup>
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The new adjustment makes the radius reduction factor in the minimum radius percentage of the corner, making it less pronounced the closer the corner's border-radius gets to 50%.
Closes #7103
Resolution: #7103 (comment)