2015-10-20 06:42:28 +03:00
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<!DOCTYPE HTML>
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<title>Testcase, bug 1209603</title>
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<style>
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p {
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font-size: 2em;
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/* ensure font-size dependency in the margin struct; this is also in
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the UA style sheet, but repeated here for clarity */
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margin: 1em 0;
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}
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</style>
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<div style="font-size: 20px"><p id="a">Should be 40px font size.</p></div>
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<script>
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var a = document.getElementById("a");
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// force computation of the margin struct on A (caching in rule tree)
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getComputedStyle(a, "").marginTop;
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</script>
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<!-- will dynamically change font-size to 10px later;
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also needs to be different from 20px now to avoid sibling-sharing -->
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<div style="font-size: 30px"><p id="b">Should be 20px font size.</p></div>
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<script>
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// Note that A and B share rule nodes, and note that the margin struct
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// has been conditionally (on font size) cached on their shared rule node.
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var b = document.getElementById("b");
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2018-03-23 16:49:21 +03:00
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// force ComputedStyle construction and computation of the font struct on
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2015-10-20 06:42:28 +03:00
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// B's parent
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getComputedStyle(b.parentNode, "").fontSize;
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2018-03-23 16:49:21 +03:00
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// force ComputedStyle construction (and computation of the color
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2015-10-20 06:42:28 +03:00
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// struct) on B, but not the margin struct or font struct
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getComputedStyle(b, "").color;
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// restyle B and flush
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b.parentNode.style.fontSize = "10px";
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getComputedStyle(b, "").marginTop;
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// This flush will call CalcStyleDifference on B, which will find no
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// cached font struct on the old context, but which will find a
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// cached margin struct on the rule node.
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</script>
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