mirror of
https://github.com/servo/servo.git
synced 2025-08-04 21:20:23 +01:00
43 lines
2 KiB
HTML
43 lines
2 KiB
HTML
<!DOCTYPE HTML>
|
|
<meta charset=utf-8>
|
|
<title>Largest Contentful Paint: observe image.</title>
|
|
<body>
|
|
<script src="/resources/testharness.js"></script>
|
|
<script src="/resources/testharnessreport.js"></script>
|
|
<script>
|
|
async_test(function (t) {
|
|
if (!window.LargestContentfulPaint) {
|
|
assert_unreached("LargestContentfulPaint is not implemented");
|
|
}
|
|
const beforeRender = performance.now();
|
|
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,
|
|
'The rendering timestamp should occur after script starts running.');
|
|
assert_greater_than_equal(performance.now(), entry.renderTime,
|
|
'The rendering timestamp should occur before the entry is dispatched to the observer.');
|
|
assert_equals(entry.startTime, entry.renderTime, 'startTime should equal renderTime');
|
|
assert_equals(entry.duration, 0);
|
|
// blue.png is 133 x 106.
|
|
assert_equals(entry.size, 14098);
|
|
assert_equals(entry.id, 'image_id');
|
|
// 25 is the length of "largest-contentful-paint/".
|
|
const index = window.location.href.lastIndexOf('/') - 25;
|
|
const pathname = window.location.href.substring(0, index) + '/images/blue.png';
|
|
assert_equals(entry.url, pathname);
|
|
assert_greater_than(entry.loadTime, beforeRender,
|
|
'The load timestamp should occur after script starts running.');
|
|
assert_less_than(entry.loadTime, entry.renderTime,
|
|
'The load timestamp should occur before the render timestamp.')
|
|
assert_equals(entry.element, document.getElementById('image_id'));
|
|
})
|
|
);
|
|
observer.observe({type: 'largest-contentful-paint', buffered: true});
|
|
}, 'Same-origin image is observable.');
|
|
</script>
|
|
|
|
<img src='/images/blue.png' id='image_id'/>
|
|
</body>
|