blob: a7847b3ccc000077a7791e65371bd58344dbf2ef [file] [log] [blame]
<!DOCTYPE html>
<meta charset=utf-8 />
<title>Event Timing only times certain types of trusted event.
<meta name="timeout" content="long">
<button id='button' onmousedown='mainThreadBusy(60)'
onfocus='mainThreadBusy(60)'>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/event-timing-test-utils.js></script>
let trustedClickStart;
function trustedClickAndBlockMain(id) {
return new Promise((resolve, reject) => {
trustedClickStart =;
clickOnElement(id, resolve);
function untrustedClickAndBlockMain(id) {
const target = document.getElementById(id);
// Block mainthread in the callback, as dispatchEvent() is a sync call.
target.dispatchEvent(new MouseEvent('mousedown'));
function trustedFocusAndBlockMain(id) {
const target = document.getElementById(id);
trustedFocusStart =;
// Block mainthread in the callback, as focus() is a sync call.
async_test(function(t) {
new PerformanceObserver(t.step_func_done(entryList => {
const observerCallbackTime =;
const entries = entryList.getEntries().filter(
entry => === 'mousedown');
assert_equals(entries.length, 1,
"Should only observe one entry: " +
JSON.stringify(entries) + ".");
assert_equals(entries[0].name, 'mousedown',
"The observed entry should be a click");
assert_less_than(entries[0].startTime, observerCallbackTime,
"The startTime should be before observerCallbackTime");
assert_greater_than(entries[0].startTime, trustedClickStart,
"The startTime should be after trustedClickStart");
})).observe({ entryTypes: ['event'] });
// Untrusted event of a type event timing cares about.
// Trusted event of a type event timing doesn't cares about.
// Trusted event of a type event timing cares about.
}, "Event Timing only times certain types of trusted event.");