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Diffstat (limited to '')
-rw-r--r-- | layout/base/tests/chrome/test_fixed_bg_scrolling_repaints.html | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/layout/base/tests/chrome/test_fixed_bg_scrolling_repaints.html b/layout/base/tests/chrome/test_fixed_bg_scrolling_repaints.html new file mode 100644 index 0000000000..9543340d6b --- /dev/null +++ b/layout/base/tests/chrome/test_fixed_bg_scrolling_repaints.html @@ -0,0 +1,40 @@ +<!DOCTYPE HTML> +<html> +<head> + <title>Test that we don't get unnecessary repaints with fixed backgrounds</title> + <script src="chrome://mochikit/content/tests/SimpleTest/SimpleTest.js"></script> + <script src="chrome://mochikit/content/tests/SimpleTest/paint_listener.js"></script> + <link rel="stylesheet" type="text/css" href="chrome://mochikit/content/tests/SimpleTest/test.css"/> +</head> +<!-- Need a timeout here to allow paint unsuppression before we start the test --> +<body onload="setTimeout(startTest,0)" style="background:url(blue-32x32.png) top left no-repeat fixed; background-size: 100px 2000px; overflow:hidden;"> +<div style="height: 2048px"></div> + +<pre id="test"> +<script type="application/javascript"> +SimpleTest.waitForExplicitFinish(); + +var utils = window.windowUtils; + +function startTest() { + // Do a scroll to ensure we trigger activity heuristics. + document.documentElement.scrollTop = 1; + waitForAllPaintsFlushed(function () { + document.documentElement.scrollTop = 0; + waitForAllPaintsFlushed(function () { + // Clear paint state and scroll down + utils.checkAndClearPaintedState(document.documentElement); + document.documentElement.scrollTop = 100; + waitForAllPaintsFlushed(function () { + // Make sure nothing painted + var painted = utils.checkAndClearPaintedState(document.documentElement); + is(painted, false, "Fixed background should not have been painted when scrolled"); + SimpleTest.finish(); + }); + }); + }); +} +</script> +</pre> +</body> +</html> |