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[css-values-4] initial work on vhc unit proposal text. Resolves #4329 #5108

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[css-values-4] initial work on vhc unit proposal text. Resolves #4329 #5108

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16 changes: 14 additions & 2 deletions css-values-3/Overview.bs
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Original file line number Diff line number Diff line change
Expand Up @@ -1005,7 +1005,9 @@ Relative Lengths</h3>
<tr><td>''vw''
<td>1% of viewport's width
<tr><td>''vh''
<td>1% of viewport's height
<td>1% of viewport's height when user agent chrome is minimized
<tr><td>''vhc''
<td>1% of viewport's height when user agent chrome is maximized
<tr><td>''vmin''
<td>1% of viewport's smaller dimension
<tr><td>''vmax''
Expand Down Expand Up @@ -1178,7 +1180,13 @@ Viewport-percentage Lengths: the ''vw'', ''vh'', ''vmin'', ''vmax'' units</h4>

<dt><dfn id="vh" lt="vh">vh unit</dfn>
<dd>
Equal to 1% of the height of the initial containing block.
When user agent chrome does not change size, it is equal to 1% of the height of the initial containing block.
When user agent chrome does change size, it is equal to 1% of the height of the initial containing block with the user agent chrome at its smallest size.

<dt><dfn id="vhc" lt="vhc">vhc unit</dfn>
<dd>
When user agent chrome does not change size, it is equal to 1% of the height of the initial containing block.
When user agent chrome does change size, it is equal to 1% of the height of the initial containing block with the user agent chrome at its largest size.

<dt><dfn id="vmin" lt="vmin">vmin unit</dfn>
<dd>
Expand All @@ -1188,6 +1196,10 @@ Viewport-percentage Lengths: the ''vw'', ''vh'', ''vmin'', ''vmax'' units</h4>
<dd>
Equal to the larger of ''vw'' or ''vh''.
</dl>

Note: The vh and vhc units are the same size when the user agent chrome does not change size
(for example, desktop user agents generally do not change chrome size, so vh and vhc will be the same in these situations).
For user agent whose chrome does change size, vhc is the smaller of the two units.

<wpt>
css/css-regions/interactivity/resizing/regions-resizing-003.html
Expand Down