mirror of
https://github.com/servo/servo.git
synced 2025-07-12 01:43:43 +01:00
40 lines
1.6 KiB
HTML
40 lines
1.6 KiB
HTML
<!DOCTYPE html>
|
|
<html>
|
|
<meta charset=utf-8 />
|
|
<title>Element Timing: buffer elements before onload</title>
|
|
<script src=/resources/testharness.js></script>
|
|
<script src=/resources/testharnessreport.js></script>
|
|
<script src="resources/element-timing-helpers.js"></script>
|
|
<body>
|
|
<script>
|
|
let beforeRender;
|
|
// Number of characters to be read on the initial read, before sleeping.
|
|
// Should be sufficient to do at least a first scan.
|
|
let numInitial = 75;
|
|
let sleep = 500;
|
|
async_test(function(t) {
|
|
const img_src = 'resources/progressive-image.py?name=square20.jpg&numInitial='
|
|
+ numInitial + '&sleep=' + sleep;
|
|
const observer = new PerformanceObserver(
|
|
t.step_func_done(function(entryList) {
|
|
assert_equals(entryList.getEntries().length, 1);
|
|
const entry = entryList.getEntries()[0];
|
|
const index = window.location.href.lastIndexOf('/');
|
|
const pathname = window.location.href.substring(0, index) + '/' +
|
|
img_src;
|
|
// Since the image is only fully loaded after the sleep, the render timestamp
|
|
// must be greater than |beforeRender| + |sleep|.
|
|
checkElement(entry, pathname, 'my_image', '', beforeRender + sleep);
|
|
checkNaturalSize(entry, 20, 20);
|
|
})
|
|
);
|
|
observer.observe({entryTypes: ['element']});
|
|
|
|
const img = document.createElement('img');
|
|
img.src = img_src;
|
|
img.setAttribute('elementtiming', 'my_image');
|
|
document.body.appendChild(img);
|
|
beforeRender = performance.now();
|
|
t.step_timeout(() => {assert_true(0);}, 2000);
|
|
}, "Element Timing: image render timestamp occurs after it is fully loaded.");
|
|
</script>
|