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[css-conditional-5] Define direction feature for scroll-state() queries #12664

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merged 7 commits into from
Sep 2, 2025
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[css-conditional-5] Define direction feature for scroll-state() queries #12664

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[css-conditional-5] Define direction feature for scroll-state() queries
tursunova Aug 27, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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Update css-conditional-5/Overview.bs
tabatkins Sep 2, 2025
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57 changes: 57 additions & 0 deletions css-conditional-5/Overview.bs
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Expand Up @@ -1587,6 +1587,63 @@ Scrollable: the '@container/scrollable' feature</h4>
The [=scroll container=] has [=scrollable overflow=] in its inline direction.
</dl>

<h4 id="direction">
Direction: the '@container/direction' feature</h4>

<pre class="descdef mq">
Name: direction
For: @container
Value: none | top | right | bottom | left | block-start | inline-start | block-end | inline-end | x | y | block | inline
Type: discrete
</pre>

For a [=query container=] that is a [=scroll container=],
the '@container/direction' [=container feature=] queries the direction of its most recent [=relative scroll=].
The logical values map to physical based on the direction and writing-mode of the [=query container=].
None of the values match if the container is not a [=scroll container=].

<dl dfn-type=value dfn-for="@container/direction">
<dt><dfn>none</dfn>
<dd>
The [=query container=] has not had a [=relative scroll=] yet.
<dt><dfn>top</dfn>
<dd>
The most recent [=relative scroll=] was upwards.
<dt><dfn>right</dfn>
<dd>
The most recent [=relative scroll=] was to the right.
<dt><dfn>bottom</dfn>
<dd>
The most recent [=relative scroll=] was downwards.
<dt><dfn>left</dfn>
<dd>
The most recent [=relative scroll=] was to the left.
<dt><dfn>block-start</dfn>
<dd>
The most recent [=relative scroll=] was towards the [=block-start=] direction.
<dt><dfn>inline-start</dfn>
<dd>
The most recent [=relative scroll=] was towards the [=inline-start=] direction.
<dt><dfn>block-end</dfn>
<dd>
The most recent [=relative scroll=] was towards the [=block-end=] direction.
<dt><dfn>inline-end</dfn>
<dd>
The most recent [=relative scroll=] was towards the [=inline-end=] direction.
<dt><dfn>x</dfn>
<dd>
The most recent [=relative scroll=] was in the horizontal direction.
<dt><dfn>y</dfn>
<dd>
The most recent [=relative scroll=] was in the vertical direction.
<dt><dfn>block</dfn>
<dd>
The most recent [=relative scroll=] was in the block direction.
<dt><dfn>inline</dfn>
<dd>
The most recent [=relative scroll=] was in the inline direction.
</dl>


<h2 id="container-lengths">
Container Relative Lengths: the ''cqw'', ''cqh'', ''cqi'', ''cqb'', ''cqmin'', ''cqmax'' units</h2>
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