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<!DOCTYPE html>
<html>
<head>
<title>time origin value manual test</title>
<link rel="help" href="https://w3c.github.io/hr-time/#time-origin-1">
<link rel="prefetch" href="./resources/unload-a.html">
<link rel="prefetch" href="./resources/unload-b.html">
<link rel="prefetch" href="./resources/unload-c.html">
</head>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
setup({ explicit_timeout: true });
const ACCEPTABLE_VARIANCE = 400; // ms
const isRoughlyEqual = (a, b) => Math.abs(a - b) < ACCEPTABLE_VARIANCE;
const timings = { a: {}, b: {}, c: {} };
const t = async_test("hr-time time origin");
window.mark = msg => {
timings[msg.docName][msg.lifecycleEventName] = {
performanceNow: msg.performanceNow,
dateNow: msg.dateNow
};
if (msg.docName === "c" && msg.lifecycleEventName === "unload") {
setTimeout(makeAssertions, 0);
}
};
function makeAssertions () {
t.step(() => {
const loadTimeBetweenAandB = timings.b.load.dateNow - timings.a.unload.dateNow;
const loadTimeBetweenBandC = timings.c.load.dateNow - timings.b.unload.dateNow;
assert_true(
isRoughlyEqual(loadTimeBetweenAandB, timings.b.load.performanceNow),
"Document in reused window's time origin should be time of close of pop-up box."
);
assert_true(
isRoughlyEqual(loadTimeBetweenBandC, timings.c.load.performanceNow),
"Document in reused window's time origin should be time of close of pop-up box."
);
assert_true(
!isRoughlyEqual(timings.a.unload.performanceNow, 0),
"Time origin during unload event should match that of rest of document."
);
assert_true(
!isRoughlyEqual(timings.b.unload.performanceNow, 0),
"Time origin during unload event should match that of rest of document."
);
assert_true(
!isRoughlyEqual(timings.c.unload.performanceNow, 0),
"Time origin during unload event should match that of rest of document."
);
});
t.done();
}
</script>
<h2>Description</h2>
<p>This test validates the behavior of <code>performance.now()</code> with respect to its time origin.</p>
<div id="log">
<h2>Manual Test Steps</h2>
<ol>
<li><a href="resources/unload-a.html" target="_blank">Click here</a>
</ol>
</div>
</body>
<html>
|
