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[css-align-3] When assuming orthogonal writing mode for baseline alignment, choose based on 'direction'. #7775 #8342

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Apr 6, 2023
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[css-align-3] When assuming orthogonal writing mode for baseline alignment, choose based on 'direction'. #7775 #8342

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9 changes: 6 additions & 3 deletions css-align-3/Overview.bs
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Expand Up @@ -2272,9 +2272,12 @@ Determining the Baselines of a Box</h2>
* If the box establishing the <a>alignment context</a>
has a <a>block flow direction</a> that is orthogonal to the axis of the <a>alignment context</a>,
use its <a>writing mode</a>.
* Otherwise, assume either ''horizontal-tb'' or ''vertical-lr'' 'writing-mode',
whichever is orthogonal to the box’s own 'writing-mode'.
<!-- This pairing is chosen because the most likely case for this situation is CJK. -->
* Otherwise:
* If the box’s own [=writing mode=] is vertical,
assume ''horizontal-tb''.
* If the box’s own [=writing mode=] is horizontal,
assume ''vertical-lr'' if 'direction' is ''ltr''
and ''vertical-rl'' if 'direction' is ''rtl''.

For the purposes of finding the baselines of a box,
it and all its in-flow descendants with a scrolling mechanism (see the 'overflow' property)
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