PerformanceTests/CSS/ClassInvalidation.html - Issue 313963006: Missing return after class invalidation short-cut.

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Side by Side Diff: PerformanceTests/CSS/ClassInvalidation.html

Issue 313963006: Missing return after class invalidation short-cut. (Closed) Base URL: svn://svn.chromium.org/blink/trunk

Patch Set: Use existing "root" element instead of creating a new one. Created 6 years, 6 months ago

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	1 <!DOCTYPE html>

	2 <script src="../resources/runner.js"></script>

	3 <style>

	4 .a .b { background-color: green }

	5 </style>

	6 <div id="root"></div>

	7 <script>

	8 function appendDivChildren(root, childCount, levels) {

	9 if (levels <= 0)

	10 return;

	11 for (var i = 0; i < childCount; i++) {

	12 var div = document.createElement("div");

	13 appendDivChildren(div, childCount, levels - 1)

	14 root.appendChild(div);

	15 }

	16 }

	17

	18 var root = document.getElementById("root");

	19 appendDivChildren(root, 5, 5);

	20 root.firstChild.className = "b";

	21 document.body.offsetTop; // force style recalc.

	22

	23 PerfTestRunner.measureRunsPerSecond({

	24 description: "Measure the style recalc performance when changing a class aff ecting the style of a single descendant.",

	25 run: function() {

	26 root.className = "a";

	27 root.offsetTop; // force recalc.

	28 root.className = "";

	29 root.offsetTop; // force recalc.

	30 }});

	31 </script>

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