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ee781b71b4
Vendors the [blink perf tests](https://chromium.googlesource.com/chromium/src/+/HEAD/third_party/blink/perf_tests/). These perf tests are useful to evaluate the performance of servo. The license that governs the perf tests is included in the folder. Running benchmark cases automatically is left to future work. The update.py script is taken from mozjs and slightly adapted, so we can easily filter (and patch if this should be necessary in the future. Testing: This PR just adds the perf_tests, but does not use or modify them in any way. --------- Signed-off-by: Jonathan Schwender <schwenderjonathan@gmail.com>
58 lines
1.6 KiB
HTML
Vendored
58 lines
1.6 KiB
HTML
Vendored
<!DOCTYPE html>
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<script src="../resources/runner.js"></script>
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<script src="./resources/utils.js"></script>
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<div id=root></div>
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<style>
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/* Explicit inheritance is used to trigger recalc of all elements. */
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* { z-index: inherit; }
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:root { z-index: 42; }
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</style>
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<script>
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function setup() {
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createDOMTree(root, /* siblings */ 8, /* depth */ 4);
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let leaf = document.querySelector('body div:empty');
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let style = document.createElement('style');
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// Create many non-matching rules with an expensive selector
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// implicitly scoped to a leaf node in the tree.
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//
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// @scope {
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// :not(.a0, .a1, ... .aN):not(div) { --x: 0; }
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// :not(.a0, .a1, ... .aN):not(div) { --x: 1; }
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// .
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// .
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// .
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// :not(.a0, .a1, ... .aN):not(div) { --x: M; }
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// }
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style.textContent = (() => {
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const PSEUDO_NOT_COUNT = 50;
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let selector = `:not(${[...Array(PSEUDO_NOT_COUNT).keys()].map(x => `.a${x}`).join(', ')}):not(div)`;
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const RULES = 100;
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let rules = [...Array(RULES).keys()].map(x => `${selector} { --x:${x}; }`).join('\n');
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return `
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@scope {
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${rules}
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}
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`;
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})();
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leaf.append(style);
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}
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setup();
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// Each iteration, we'll recalc all elements. Hopefully, the RuleSet within
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// the style element beneath the leaf node can be completely ignored for all
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// elements except `leaf`.
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PerfTestRunner.measureTime({
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description: 'An implicit whole-RuleSet @scope deep in the tree',
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run: () => {
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root.offsetTop;
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root.style.zIndex = '43';
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root.offsetTop;
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root.style.zIndex = '42';
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}
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});
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</script>
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