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[css-inline-3] text-box-trim and multi-column containers #11363
Description
In #5335 we resolved that, when applying to a multi-column container, text-box-trim applies to every column; and in #11038 we clarified that text-box-trim applied to an ancestor also propagates accordingly.
However, we didn't discuss what happens if there's a column spanner. Technically there are column boxes both before and after the spanner, not a single column split by a spanner.
I imagine that if you want to trim in order to position the multi-column container, you probably don't want to affect its internal layout; so I suggest we only target the column boxes in the first/last row of column boxes--or the spanner, if that's the first/last item in a column...
Activity
mstensho commentedon Dec 18, 2024
Makes sense to me.
However:
Spanners aren't really part of any columns, so maybe: "or the spanner, if that's the first/last item in a multicol container."
css-meeting-bot commentedon Jan 8, 2025
The CSS Working Group just discussed
[css-inline-3] text-box-trim and multi-column containers, and agreed to the following:RESOLVED: Apply text-box-trim to a column box or spanner iff it is adjacent to the relevant edgeThe full IRC log of that discussion
<kbabbitt> fantasai: we talked about applying text-box-trim to multicol containers<kbabbitt> ... said it applies to every column
<kbabbitt> ... we didn't discuss what happens if there's a column spanner
<kbabbitt> ... it can occur before or after the column box
<kbabbitt> ... also you can have column boxes that span in the middle of the multicol container
<kbabbitt> ... and only want to trim the columns on the outsides
<kbabbitt> ... I think we want to clarify
<kbabbitt> ... suggest that we only target column boxes adjacent to edge of multicol container
<kbabbitt> ... and that we also trim spanners if present
<rachelandrew> q+
<kbabbitt> astearns: we only target things if they are adjacent to the appropriate edge?
<kbabbitt> fantasai: yes
<kbabbitt> rachelandrew: sounds good to me
<kbabbitt> ... that would then work if we do block-direction overflow for columns, same issue but without spanner
<fantasai> PROPOSAL: Apply text-box-trim to a column box or spanner if it is adjacent to the relevant edge
<fantasai> s/if/iff/
<kbabbitt> RESOLVED: Apply text-box-trim to a column box or spanner iff it is adjacent to the relevant edge