mirror of
https://github.com/servo/servo.git
synced 2025-10-15 16:00:28 +01:00
41 lines
1.6 KiB
HTML
41 lines
1.6 KiB
HTML
<!DOCTYPE HTML>
|
|
<meta charset=utf-8>
|
|
<title>Largest Contentful Paint: observe text.</title>
|
|
<body>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<style>
|
|
p {
|
|
font-size: 12px;
|
|
}
|
|
</style>
|
|
<script>
|
|
async_test(function (t) {
|
|
assert_implements(window.LargestContentfulPaint, "LargestContentfulPaint is not implemented");
|
|
let beforeRender;
|
|
const observer = new PerformanceObserver(
|
|
t.step_func_done(function(entryList) {
|
|
assert_equals(entryList.getEntries().length, 1);
|
|
const entry = entryList.getEntries()[0];
|
|
assert_equals(entry.entryType, 'largest-contentful-paint');
|
|
assert_greater_than_equal(entry.renderTime, beforeRender);
|
|
assert_greater_than_equal(performance.now(), entry.renderTime);
|
|
assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime');
|
|
assert_equals(entry.duration, 0);
|
|
// Some lower bound: height of at least 12 px.
|
|
// Width of at least 100 px.
|
|
// TODO: find a good way to bound text width.
|
|
assert_greater_than_equal(entry.size, 1200);
|
|
assert_equals(entry.loadTime, 0);
|
|
assert_equals(entry.id, 'my_text');
|
|
assert_equals(entry.url, '');
|
|
assert_equals(entry.element, document.getElementById('my_text'));
|
|
})
|
|
);
|
|
observer.observe({type: 'largest-contentful-paint', buffered: true});
|
|
beforeRender = performance.now();
|
|
}, 'Element with elementtiming attribute is observable.');
|
|
</script>
|
|
|
|
<p id='my_text'>This is important text! :)</p>
|
|
</body>
|