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[css-containment] Fix layout containment and fragmentainer interaction #34

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Merged
merged 4 commits into from
Jul 7, 2015
Merged

[css-containment] Fix layout containment and fragmentainer interaction #34

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4ce37eb
[css-containment] Fix layout containment and fragmentainer interaction
frivoal Jul 7, 2015
29c0b70
[css-containment] Fixup based on code review.
frivoal Jul 7, 2015
f88fc8c
[css-containment] Remove explicit spec links after fixing that spec
frivoal Jul 7, 2015
54d6873
[css-containment] Use fully qualified names
frivoal Jul 7, 2015
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31 changes: 31 additions & 0 deletions css-containment/Overview.bs
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Expand Up @@ -138,6 +138,37 @@ Layout Containment</h3>

2. The element must be a <a>formatting context</a>.

3. If a <a>fragmentation context</a> participates in <a>layout containment</a>,
the first element with <a>layout containment</a>
affecting the <a>fragmentation context</a>
must “trap” the remainder of the <a>fragmented flow</a>.
<a>Fragmentation</a> must not continue past the <a>layout containment</a> boundary,
and the last <a>fragmentation container</a>
within the first <a>layout containment</a> boundary
is treated as if it is the last <a>fragmentation container</a>
in its <a>fragmentation context</a>.

If subsequent <a>fragmentation containers</a> in the <a>fragmentation context</a>
are only generated when more content remains in the <a>fragmented flow</a>,
then they are not generated.
If they would exist regardless,
they remain part of the <a>fragmentation context</a>,
but do not receive any content from the <a>fragmented flow</a>.

Specifically:
- <a>CSS Regions</a> following the one which traps the content
are still considered part of the <a>region chain</a>
as returned by the {{NamedFlow/getRegions()}} method
of the {{NamedFlow}} interface.
- the {{Region/regionOverset}} attribute of the {{Region}} interface
of the region which traps the content
is set to ''overset'' if the content doesn't fit,
even if it is not the last region in the region chain.
- If the computed value of the 'continue' property
on an element with <a>layout containment</a>
would otherwise have been ''continue/auto'' or ''continue/fragments'',
it must instead compute to ''continue/overflow''.

Possible optimizations that can be enabled by <a>layout containment</a> include (but are not limited to):

1. When the style or contents of a descendant of the containing element is changed,
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