forked from mirrors/gecko-dev
4358a07aad
MozReview-Commit-ID: EsDTzjLkqVk --HG-- extra : rebase_source : 9dd98c3d058fafa993b60d7f15012c1ffedcc0ad
61 lines
2.1 KiB
HTML
61 lines
2.1 KiB
HTML
<!doctype html>
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<meta charset="utf-8">
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<title>
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Test for bug 1273303: Stylesheet additions and removals known to not
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affect the document don't trigger restyles
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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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<div class="classScope">
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<div></div>
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</div>
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<div id="idScope">
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<div></div>
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</div>
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<!--
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We do it this way, using `disabled`, because appending stylesheets to the
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document marks a restyle for that <style> element as needed, so we can't
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accurately measure whether we've restyled or not.
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-->
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<style id="target" disabled></style>
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<script>
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SimpleTest.waitForExplicitFinish();
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const utils = SpecialPowers.getDOMWindowUtils(window);
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const TESTS = [
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{ selector: ".nonexistentClassScope", restyle: false },
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{ selector: ".nonexistentClassScope + div", restyle: true },
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{ selector: ".nonexistentClassScope div + div", restyle: false },
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{ selector: ".classScope", restyle: true },
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{ selector: ".classScope div", restyle: true },
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{ selector: "#idScope", restyle: true },
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{ selector: "#nonexistentIdScope", restyle: false },
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{ selector: "#nonexistentIdScope div + bar", restyle: false },
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];
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for (const test of TESTS) {
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target.innerHTML = test.selector + " { color: green; }";
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document.body.offsetWidth;
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const prevGeneration = utils.restyleGeneration;
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target.disabled = true;
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document.body.offsetWidth;
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(test.restyle ? isnot : is)(utils.restyleGeneration, prevGeneration,
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`Stylesheet removal with ${test.selector} should ${test.restyle ? "have" : "not have"} caused a restyle`);
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target.disabled = false; // Make the stylesheet effective.
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let element = document.querySelector(test.selector);
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if (element) {
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is(test.restyle, true, "How could we not expect a restyle?");
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is(getComputedStyle(element).color, "rgb(0, 128, 0)",
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"Element style should've changed appropriately");
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}
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document.body.offsetWidth;
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(test.restyle ? isnot : is)(utils.restyleGeneration, prevGeneration,
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`Stylesheet addition with ${test.selector} should ${test.restyle ? "have" : "not have"} caused a restyle`);
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}
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SimpleTest.finish();
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</script>
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