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Roy Tam 2018-01-19 03:59:58 +08:00
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12
layout/reftests/w3c-css/submitted/will-change/green-square-100-by-100-offset-ref.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change reference</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px; margin: 100px 0 0 100px; background: green }
</style>
<body>
<div></div>
</body>

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change reference</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px; background: green }
</style>
<body>
<div></div>
</body>

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layout/reftests/w3c-css/submitted/will-change/reftest-stylo.list Normal file
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# DO NOT EDIT! This is a auto-generated temporary list for Stylo testing
== will-change-stacking-context-clip-path-1.html will-change-stacking-context-clip-path-1.html
== will-change-stacking-context-filter-1.html will-change-stacking-context-filter-1.html
== will-change-stacking-context-height-1.html will-change-stacking-context-height-1.html
== will-change-stacking-context-isolation-1.html will-change-stacking-context-isolation-1.html
== will-change-stacking-context-mask-1.html will-change-stacking-context-mask-1.html
== will-change-stacking-context-mix-blend-mode-1.html will-change-stacking-context-mix-blend-mode-1.html
== will-change-stacking-context-opacity-1.html will-change-stacking-context-opacity-1.html
== will-change-stacking-context-perspective-1.html will-change-stacking-context-perspective-1.html
== will-change-stacking-context-position-1.html will-change-stacking-context-position-1.html
== will-change-stacking-context-transform-1.html will-change-stacking-context-transform-1.html
== will-change-stacking-context-transform-style-1.html will-change-stacking-context-transform-style-1.html
== will-change-stacking-context-z-index-1.html will-change-stacking-context-z-index-1.html
test-pref(layout.css.contain.enabled,true) == will-change-fixpos-cb-contain-1.html will-change-fixpos-cb-contain-1.html
== will-change-fixpos-cb-filter-1.html will-change-fixpos-cb-filter-1.html
== will-change-fixpos-cb-height-1.html will-change-fixpos-cb-height-1.html
== will-change-fixpos-cb-perspective-1.html will-change-fixpos-cb-perspective-1.html
== will-change-fixpos-cb-position-1.html will-change-fixpos-cb-position-1.html
== will-change-fixpos-cb-transform-1.html will-change-fixpos-cb-transform-1.html
== will-change-fixpos-cb-transform-style-1.html will-change-fixpos-cb-transform-style-1.html

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== will-change-stacking-context-clip-path-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-filter-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-height-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-isolation-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-mask-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-mix-blend-mode-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-opacity-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-perspective-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-position-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-transform-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-transform-style-1.html green-square-100-by-100-ref.html
== will-change-stacking-context-z-index-1.html green-square-100-by-100-ref.html
test-pref(layout.css.contain.enabled,true) == will-change-fixpos-cb-contain-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-filter-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-height-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-perspective-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-position-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-transform-1.html green-square-100-by-100-offset-ref.html
== will-change-fixpos-cb-transform-style-1.html green-square-100-by-100-offset-ref.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: contain' creates a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="https://drafts.csswg.org/css-containment/#containment-paint">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: contain; margin: 100px 0 0 100px; background: red }
.child { top: 0; left: 0; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

25
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: filter' creates a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/filter-effects/#FilterProperty">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: filter; margin: 100px 0 0 100px; background: red }
.child { top: 0; left: 0; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

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layout/reftests/w3c-css/submitted/will-change/will-change-fixpos-cb-height-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: height' does not create a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: height; margin: 100px 0 0 100px; background: red }
.child { top: 100px; left: 100px; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 150px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

25
layout/reftests/w3c-css/submitted/will-change/will-change-fixpos-cb-perspective-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: perspective' creates a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#perspective-property">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: perspective; margin: 100px 0 0 100px; background: red }
.child { top: 0; left: 0; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

24
layout/reftests/w3c-css/submitted/will-change/will-change-fixpos-cb-position-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: position' does not create a containing block for fixed positioned elements but does create a containing block for absolutely positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: position; margin: 100px 0 0 100px; background: red }
.child { width: 50px; background: green }
#fixpos { position: fixed; top: 100px; left: 100px }
#abspos { position: absolute; top: 0; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

25
layout/reftests/w3c-css/submitted/will-change/will-change-fixpos-cb-transform-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: transform' creates a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#transform-property">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: transform; margin: 100px 0 0 100px; background: red }
.child { top: 0; left: 0; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

25
layout/reftests/w3c-css/submitted/will-change/will-change-fixpos-cb-transform-style-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: transform-style' creates a containing block for fixed positioned elements</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#transform-style-property">
<link rel="match" href="green-square-100-by-100-offset-ref.html">
<meta name="assert" content="If any non-initial value of a property would cause the element to generate a containing block for fixed-position elements, specifying that property in will-change must cause the element to generate a containing block for fixed-position elements.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: transform-style; margin: 100px 0 0 100px; background: red }
.child { top: 0; left: 0; width: 50px; background: green }
#fixpos { position: fixed }
#abspos { position: absolute; left: 50px }
</style>
<body>
<div id="wc">
<div class="child" id="fixpos">
</div>
<div class="child" id="abspos">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-clip-path-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: clip-path' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css-masking/#the-clip-path">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: clip-path; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-filter-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: filter' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/filter-effects/#FilterProperty">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: filter; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

20
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-height-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: height' does not create a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: height; background: green }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: red }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-isolation-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: isolation' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/compositing-1/#isolation">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: isolation; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-mask-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: mask' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css-masking/#the-mask-image">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: mask; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-mix-blend-mode-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: mix-blend-mode' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/compositing-1/#mix-blend-mode">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: mix-blend-mode; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-opacity-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: opacity' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="https://drafts.csswg.org/css-color-3/#transparency">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: opacity; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-perspective-1.html Normal file
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@ -0,0 +1,21 @@
<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: perspective' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#perspective-property">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: perspective; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-position-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: position' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-positioning/#sticky-pos">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: position; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-transform-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: transform' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#transform-property">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: transform; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-transform-style-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: transform-style' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-transforms/#transform-style-property">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: transform-style; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>

21
layout/reftests/w3c-css/submitted/will-change/will-change-stacking-context-z-index-1.html Normal file
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<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS will-change: 'will-change: z-index' creates a stacking context</title>
<link rel="author" title="L. David Baron" href="https://dbaron.org/">
<link rel="author" title="Mozilla" href="http://www.mozilla.org/">
<link rel="help" href="https://drafts.csswg.org/css-will-change-1/#will-change">
<link rel="help" href="http://www.w3.org/TR/css3-positioning/#layered-presentation">
<link rel="match" href="green-square-100-by-100-ref.html">
<meta name="assert" content="If any non-initial value of a property would create a stacking context on the element, specifying that property in will-change must create a stacking context on the element.">
<style>
html, body { margin: 0; padding: 0; }
div { width: 100px; height: 100px }
#wc { will-change: z-index; background: red }
#child { position: absolute; top: 0; left: 0; z-index: -1; background: green }
</style>
<body>
<div id="wc">
<div id="child">
</div>
</div>
</body>