72 lines
2.6 KiB
HTML
72 lines
2.6 KiB
HTML
<!DOCTYPE HTML>
|
|
<meta charset=utf-8>
|
|
<title>Layout Instability: observe timestamp after user input</title>
|
|
|
|
<body>
|
|
<style>
|
|
#myDiv {
|
|
position: relative;
|
|
width: 300px;
|
|
height: 100px;
|
|
background: blue;
|
|
}
|
|
|
|
/* Disable the button's focus ring, which otherwise expands its visual rect by
|
|
* 1px on all sides, triggering a layout shift event.
|
|
*/
|
|
#button {
|
|
outline: none;
|
|
}
|
|
</style>
|
|
<div id='myDiv'></div>
|
|
<button id='button'>Generate a 'click' event</button>
|
|
<script src=/resources/testharness.js></script>
|
|
<script src=/resources/testharnessreport.js></script>
|
|
<script src=/resources/testdriver.js></script>
|
|
<script src=/resources/testdriver-vendor.js></script>
|
|
<script src=resources/util.js></script>
|
|
<script src=/event-timing/resources/event-timing-test-utils.js></script>
|
|
<script>
|
|
let timeAfterClick;
|
|
|
|
promise_test(async t => {
|
|
assert_implements(window.LayoutShift, 'Layout Instability is not supported.');
|
|
// Wait for the initial render to complete.
|
|
await waitForAnimationFrames(2);
|
|
|
|
const startTime = performance.now();
|
|
return new Promise(resolve => {
|
|
const observer = new PerformanceObserver(
|
|
t.step_func(entryList => {
|
|
const endTime = performance.now();
|
|
assert_equals(entryList.getEntries().length, 1);
|
|
const entry = entryList.getEntries()[0];
|
|
assert_equals(entry.entryType, "layout-shift");
|
|
assert_equals(entry.name, "");
|
|
assert_greater_than_equal(entry.startTime, startTime);
|
|
assert_less_than_equal(entry.startTime, endTime);
|
|
assert_equals(entry.duration, 0.0);
|
|
// The layout shift value should be:
|
|
// 300 * (100 + 60) * (60 / maxDimension) / viewport size.
|
|
assert_equals(entry.value, computeExpectedScore(300 * (100 + 60), 60));
|
|
// We should see that there was a click input entry.
|
|
assert_equals(entry.hadRecentInput, false);
|
|
assert_greater_than_equal(timeAfterClick, entry.lastInputTime);
|
|
resolve();
|
|
})
|
|
);
|
|
observer.observe({ entryTypes: ['layout-shift'] });
|
|
// User input event
|
|
clickAndBlockMain('button').then(() => {
|
|
// 600ms delay
|
|
step_timeout(function() {
|
|
timeAfterClick = performance.now();
|
|
// Modify the position of the div.
|
|
document.getElementById('myDiv').style = "top: 60px";
|
|
}, 600);
|
|
});
|
|
});
|
|
}, 'Layout shift right after user input is observable via PerformanceObserver.');
|
|
</script>
|
|
|
|
</body>
|