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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" >
<title>window.performance.now across frames</title>
<link rel="author" title="Google" href="http://www.google.com/">
<link rel="help" href="http://www.w3.org/TR/hr-time/#sec-extenstions-performance-interface">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script type="text/javascript">
setup({explicit_done: true});
var setup_frame = async_test("Setup the frame");
function start_test() {
setup_frame.step_timeout(function () {
var iframe = document.createElement('iframe');
iframe.id = 'frameContext';
iframe.onload = finish_test;
iframe.src = "resources/now_frame.html";
document.body.appendChild(iframe);
setup_frame.done();
}, 1000);
}
function finish_test() {
var childWindow = document.getElementById('frameContext').contentWindow;
// Verify a positive number is returned for both the frame and parent.
test(function() { assert_true(window.performance.now() > 0); }, 'parent performance.now() > 0');
test(function() { assert_true(childWindow.performance.now() > 0); }, 'child performance.now() > 0');
// Verify that the test properly created the child at least a second after the parent.
test(function () { assert_true(childWindow.performance.timing.navigationStart > (window.performance.timing.navigationStart + 1000)); },
'Child created at least 1 second after parent');
test(function () {
var parentNow = window.performance.now();
var childNow = childWindow.performance.now();
var childParentSkew = Math.abs(childNow - parentNow);
assert_true(childParentSkew > 1000, 'Child and parent\'s now()s have different bases (skewed more than 1 second)');
var childLoadTime = childWindow.performance.timing.loadEventStart - childWindow.performance.timing.navigationStart;
assert_true(1000 > (childNow - childLoadTime), 'Child\'s now() is based on its document\'s navigationStart');
}, 'Child and parent time bases are correct');
done();
}
</script>
</head>
<body onload="start_test()">
<h1>Description</h1>
<p>This test validates the values of the window.performance.now() are based on the current document's navigationStart.</p>
<div id="log"></div>
</body>
</html>
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