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[csswg-drafts] [css-align] [css-multicol] Baseline of multicol container (#6281)

From: Morten Stenshorne via GitHub <sysbot+gh@w3.org>
Date: Tue, 11 May 2021 09:19:29 +0000
To: public-css-archive@w3.org
Message-ID: <issues.opened-886614708-1620724767-sysbot+gh@w3.org>
mstensho has just created a new issue for https://github.com/w3c/csswg-drafts:

== [css-align] [css-multicol] Baseline of multicol container ==
https://drafts.csswg.org/css-align/#baseline-export

> The first baseline set of a multi-column container is generated from the dominant first baseline of the first in-flow line box in the first column box, or is taken from the first in-flow block-level child that contributes a set of first baselines, whichever comes first.

The "first column box" thing here is a bit ambiguous. Is it the first column box in the multicol container, or the first column box in a multicol line/row [1]? 

Also, when the spec says:
> the first in-flow block-level child that contributes a set of first baselines

Does that apply in any column [2], or does it still apply to the "first column box" only? My guess is the latter.

What about a column spanner, if it has a baseline [3], but the previous column(s) didn't?

[1]
```
<div style="columns:3;">
  <div style="height:150px;"></div>
  <div style="column-span:all; height:50px;"></div>
  Baseline here? Probably?
</div>
```

[2]
```
<div style="columns:3;">
  <div style="height:150px;"></div>
  <div>baseline here? Probably not?</div>
</div>
```

[3]
```
<div style="columns:3;">
  <div style="height:150px;"></div>
  <div style="column-span:all;">baseline here? Probably?</div>
</div>
```

Please view or discuss this issue at https://github.com/w3c/csswg-drafts/issues/6281 using your GitHub account


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