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Quellcode-Bibliothek 1209603-1.html Sprache: HTML |
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<!DOCTYPE HTML> <title>Testcase, bug 1209603</title> <style> p { font-size: 2em; /* ensure font-size dependency in the margin struct; this is also in the UA style sheet, but repeated here for clarity */ margin: 1em 0; } </style> <div style="font-size: 20px"><p id="a">Should be 40px font size.</p></div> <script> var a = document.getElementById("a"); // force computation of the margin struct on A (caching in rule tree) getComputedStyle(a, "").marginTop; </script> <!-- will dynamically change font-size to 10px later; also needs to be different from 20px now to avoid sibling-sharing --> <div style="font-size: 30px"><p id="b">Should be 20px font size.</p></div> <script> // Note that A and B share rule nodes, and note that the margin struct // has been conditionally (on font size) cached on their shared rule node. var b = document.getElementById("b"); // force ComputedStyle construction and computation of the font struct on // B's parent getComputedStyle(b.parentNode, "").fontSize; // force ComputedStyle construction (and computation of the color // struct) on B, but not the margin struct or font struct getComputedStyle(b, "").color; // restyle B and flush b.parentNode.style.fontSize = "10px"; getComputedStyle(b, "").marginTop; // This flush will call CalcStyleDifference on B, which will find no // cached font struct on the old context, but which will find a // cached margin struct on the rule node. </script>
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2026-04-04