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Quelle test_computed_style_no_flush.html Sprache: HTML |
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<!doctype html> <meta charset="utf-8"> <title> Test for bug 1363805: We only restyle as little as needed </title> <link rel="author" href="mailto:wpan@mozilla.com" title="Wei-Cheng Pan"> <script src="/tests/SimpleTest/SimpleTest.js"></script> <style> .black { background-color: black; } .black + div { background-color: gray; } </style> <div id="container"> <div> <div id="foo"> </div> <div id="bar"> </div> </div> </div> <script> function flushStyle () { getComputedStyle(document.body).width; } SimpleTest.waitForExplicitFinish(); const utils = SpecialPowers.getDOMWindowUtils(window); const container = document.querySelector('#container'); const foo = document.querySelector('#foo'); const bar = document.querySelector('#bar'); flushStyle(); let currentRestyleGeneration = utils.restyleGeneration; // No style changed, so we should not restyle. getComputedStyle(foo).backgroundColor; is(utils.restyleGeneration, currentRestyleGeneration, "Shouldn't restyle anything if no style changed"); // foo's parent has changed, must restyle. container.classList.toggle('black'); getComputedStyle(foo).backgroundColor; isnot(utils.restyleGeneration, currentRestyleGeneration, "Should have restyled something"); currentRestyleGeneration = utils.restyleGeneration; // The change of foo should not affect its parent. foo.classList.toggle('black'); getComputedStyle(container).backgroundColor; is(utils.restyleGeneration, currentRestyleGeneration, "Shouldn't restyle anything if no style changed"); // It should restyle for foo's later sibling. getComputedStyle(bar).backgroundColor; isnot(utils.restyleGeneration, currentRestyleGeneration, "Should have restyled something"); SimpleTest.finish(); </script>
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2026-04-04