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[css-containment] Clarify ambiguous phrasing #831

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merged 2 commits into from
Jan 12, 2017
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[css-containment] Clarify ambiguous phrasing #831

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[css-containment] Clarify ambiguous phrasing
frivoal Dec 23, 2016
e9b23f2
Merge branch 'master' into containment-must-be-clarifications
tabatkins Jan 12, 2017
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20 changes: 13 additions & 7 deletions css-containment/Overview.bs
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Expand Up @@ -184,10 +184,7 @@ Layout Containment</h3>

Giving an element <dfn export>layout containment</dfn> has the following effects:

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

Issue: This needs to specify how it becomes a formatting
context (and which type it becomes).
1. The element <a>becomes a formatting context</a>.

2. If a <a>fragmentation context</a> participates in <a>layout containment</a>,
the first element with <a>layout containment</a>
Expand Down Expand Up @@ -286,9 +283,9 @@ Paint Containment</h3>
to access or indicate the presence of the clipped content;
nor does it inhibit the creation of any such mechanism through other properties,
such as 'overflow', 'resize', or 'text-overflow'.
2. The element must act as a containing block for absolutely positioned and fixed positioned descendants.
3. The element must be a <a>stacking context</a>.
4. The element must be a <a>formatting context</a>.
2. The element acts as a containing block for absolutely positioned and fixed positioned descendants.
3. The element creates a <a>stacking context</a>.
4. The element <a>becomes a formatting context</a>.

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

Expand All @@ -308,6 +305,15 @@ Paint Containment</h3>
3. Because they are guaranteed to be stacking contexts,
scrolling elements can be painted into a single GPU layer.

<h2 id="becoming-formatting-context">Becoming a formatting context</h2>

When required by <a>layout containment</a> and <a>paint containment</a>,
an element may need to <dfn lt='become a formatting context|becomes a formatting context'>become a <a>formatting context</a></dfn>.
If the element already establishes a <a>formatting context</a> of any kind,
this condition is satisfied.
Otherwise, it is made to establish a <a>BFC</a> by changing its <a>inner display type</a> to ''flow-root''.


Privacy and Security Considerations {#privsec}
==============================================

Expand Down