зеркало из https://github.com/mozilla/gecko-dev.git
46 строки
1.2 KiB
HTML
46 строки
1.2 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>
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Test for bug 1368240: We only invalidate style as little as needed
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</title>
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<link rel="author" href="mailto:emilio@crisal.io" title="Emilio Cobos Álvarez">
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<script src="/tests/SimpleTest/SimpleTest.js"></script>
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<style>
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.foo .bar {
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color: red;
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}
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#container ~ .bar {
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color: green;
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}
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</style>
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<div id="container">
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<div></div>
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<div></div>
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<div></div>
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</div>
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<div></div>
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<div></div>
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<script>
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SimpleTest.waitForExplicitFinish();
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const utils = SpecialPowers.getDOMWindowUtils(window);
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// TODO(emilio): Add an API to get the ComputedStyles we've recreated, to make
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// more elaborated tests.
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document.documentElement.offsetTop;
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const initialRestyleGeneration = utils.restyleGeneration;
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// Normally we'd restyle the whole subtree in this case, but we should go down
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// the tree invalidating as little as needed (nothing in this case).
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container.classList.add("foo");
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document.documentElement.offsetTop;
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is(utils.restyleGeneration, initialRestyleGeneration,
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"Shouldn't have restyled any descendant");
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container.setAttribute("id", "");
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document.documentElement.offsetTop;
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is(utils.restyleGeneration, initialRestyleGeneration,
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"Shouldn't have restyled any sibling");
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SimpleTest.finish();
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</script>
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