<!DOCTYPE html>
<meta charset=utf-8>
<title>Test RequestAnimationFrame Timestamps are monotonically increasing</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<script>
var lastRequestAnimationFrameTimestamp = 0;
var requestAnimationFrameCount = 20;
var currentCount = 0;
// Test that all timestamps are always increasing
// and do not ever go backwards
function rafCallback(aTimestamp) {
SimpleTest.ok(aTimestamp > lastRequestAnimationFrameTimestamp,
"New RequestAnimationFrame timestamp should be later than the previous RequestAnimationFrame timestamp");
lastRequestAnimationFrameTimestamp = aTimestamp;
if (currentCount == requestAnimationFrameCount) {
SimpleTest.finish();
} else {
currentCount++;
window.requestAnimationFrame(rafCallback);
}
}
window.requestAnimationFrame(rafCallback);
SimpleTest.waitForExplicitFinish();
</script>