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[css-borders-4] Define the 'corners' shorthand #12359

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[css-borders-4] Define the 'corners' shorthand #12359

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25 changes: 25 additions & 0 deletions css-borders-4/Overview.bs
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Expand Up @@ -606,6 +606,31 @@ The 'corner-*-shape' Shorthands And Longhands</h4>
That is, ''corner-block-start-shape: round square''
sets ''corner-start-start-shape: round; corner-start-end-shape: square;''.

<h4 id=corners-shorthand>
The 'corners' Shorthands</h4>

<pre class=propdef>
Name: corners
Value: <<corner-value>> [ / <<corner-value>> ]{0,3}
Initial: round
Applies to: all elements where 'border-radius' can apply
Inherited: no
Logical property group: corner-shape
Computed value: the corresponding ''superellipse()'' value
Animation Type: see [=superellipse interpolation=]
</pre>

<pre class=prod>
'corners' = <<corner-value>> [ / <<corner-value>> ]{0,3}
<<corner-value>> = [ <<length-percentage [0,&infin;]>> && <<corner-shape-value>> ] | normal
</pre>

The 'corners' shorthand corresponds to all the four 'corner-*-*-shape' and 'border-*-*-radius',
in the order top-left, top-right, bottom-right, bottom-left. If bottom-left is omitted it is the same as top-right. If bottom-right is omitted it is the same as top-left. If top-right is omitted it is the same as top-left.

Each <dfn><<corner-value>></dfn> includes both a 'border-*-*-radius' and a 'corner-*-*-shape' value,
or a <dfn dfn-type=value dfn-for=corners>normal</dfn> keyword that resolves to a <code>0px</code> ''border-radius'' with a ''corner-shape/round'' corner.

<h4 id=corner-shape-rendering>
Rendering 'corner-shape'</h4>

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