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[css-contain] Prepare for publication
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‎css-contain-1/Overview.bs‎

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Title: CSS Containment Module Level 1
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Level: 1
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Shortname: css-contain
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Status: ED
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Work Status: Revising
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Status: CR
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date: 2018-05-17
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deadline: 2018-07-16
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Work Status: Testing
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Group: csswg
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ED: https://drafts.csswg.org/css-contain/
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TR: https://www.w3.org/TR/css-contain-1/
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Previous Version: https://www.w3.org/TR/2017/CR-css-contain-1-20170808/
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Previous Version: https://www.w3.org/TR/2017/WD-css-contain-1-20170419/
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Previous Version: https://www.w3.org/TR/2017/WD-css-contain-1-20170221/
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Editor: Tab Atkins, Google, http://xanthir.com/contact/, w3cid 42199
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spec: css-backgrounds-3;
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type: dfn; url: https://drafts.csswg.org/css-backgrounds-3/#corner-clipping; text: corner clipping
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</pre>
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<pre class=link-defaults>
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spec:css21; type:property; text:content
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spec:css21; type:property; text:counter-increment
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spec:css21; type:dfn; text:stacking context
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spec:css-display-3; type:property; text:display
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</pre>
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<h2 id='intro'>
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Introduction</h2>
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This does not include the creation of any mechanism
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to access or indicate the presence of the clipped content;
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nor does it inhibit the creation of any such mechanism through other properties,
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such as 'overflow', 'resize', or 'text-overflow'.
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<span class=informative>such as 'overflow', 'resize', or 'text-overflow'</span>.
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<span class=note>This is as if to ''overflow: visible'' was changed to ''overflow: clip'' at used value.</span>
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2. The element acts as a containing block for absolutely positioned and fixed positioned descendants.
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3. The element creates a <a>stacking context</a>.
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4. The element [=establishes an independent formatting context=].
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<div class=informative>
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Possible optimizations that can be enabled by <a>paint containment</a> include (but are not limited to):
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1. If the containing element is off-screen or obscured,
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3. Because they are guaranteed to be stacking contexts,
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scrolling elements can be painted into a single GPU layer.
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</div>
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Privacy and Security Considerations {#privsec}

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