1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/layout/base/tests/chrome/test_fixed_bg_scrolling_repaints.html Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,36 @@
1.4 +<!DOCTYPE HTML>
1.5 +<html>
1.6 +<head>
1.7 + <title>Test that we don't get unnecessary repaints with fixed backgrounds</title>
1.8 + <script type="application/javascript" src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script>
1.9 + <script type="text/javascript" src="chrome://mochikit/content/tests/SimpleTest/paint_listener.js"></script>
1.10 + <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/>
1.11 +</head>
1.12 +<!-- Need a timeout here to allow paint unsuppression before we start the test -->
1.13 +<body onload="setTimeout(startTest,0)" style="background: url(blue-32x32.png) fixed">
1.14 +<div style="height: 2048px"></div>
1.15 +<pre id="test">
1.16 +<script type="application/javascript">
1.17 +SimpleTest.waitForExplicitFinish();
1.18 +
1.19 +var utils = window.QueryInterface(Components.interfaces.nsIInterfaceRequestor).
1.20 + getInterface(Components.interfaces.nsIDOMWindowUtils);
1.21 +
1.22 +function startTest() {
1.23 + // Do a scroll to ensure we trigger activity heuristics.
1.24 + waitForAllPaintsFlushed(function () {
1.25 + // Clear paint state and scroll down
1.26 + utils.checkAndClearPaintedState(document.body);
1.27 + document.documentElement.scrollTop = 100;
1.28 + waitForAllPaintsFlushed(function () {
1.29 + // Make sure the body didn't paint
1.30 + var painted = utils.checkAndClearPaintedState(document.body);
1.31 + is(painted, false, "Fixed background should not have been painted when scrolled");
1.32 + SimpleTest.finish();
1.33 + });
1.34 + });
1.35 +}
1.36 +</script>
1.37 +</pre>
1.38 +</body>
1.39 +</html>
