98 lines
3.7 KiB
HTML
98 lines
3.7 KiB
HTML
<!DOCTYPE html>
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<html>
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<meta charset=utf-8 />
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<meta name="timeout" content="long">
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<title>Event Timing: visibility change.</title>
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<script src=/resources/testharness.js></script>
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<script src=/resources/testharnessreport.js></script>
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<script src=/resources/testdriver.js></script>
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<script src=/resources/testdriver-vendor.js></script>
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<script src=/resources/testdriver-actions.js></script>
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<script src=/page-visibility/resources/window_state_context.js></script>
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<script src=resources/event-timing-test-utils.js></script>
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<body>
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<button id='target'>Click me</button>
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<script>
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let observedEntries = [];
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const map = new Map();
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const events = ['pointerup'];
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promise_test(async t => {
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assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');
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const { minimize, restore } = window_state_context(t);
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const button = document.getElementById('target');
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const callback = (entryList) => { observedEntries = observedEntries.concat(entryList.getEntries().filter(filterAndAddToMap(events, map))); };
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const readyToResolve = () => { return observedEntries.length >= 1; };
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const observerPromise = createPerformanceObserverPromise(['event'], callback, readyToResolve);
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const tapEventPromise = new Promise(resolve => {
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button.addEventListener('pointerup', async (event) => {
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document.body.innerText += "Adding content to force rendering";
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// await here will yield to event loop, and end event processing time,
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// which will allow rendering to continue.
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// The visibility change may happen before rendering has a chance
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// but it is not guarenteed which will happen first.
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await minimize();
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const timeAfterVisibilityFalse = performance.now();
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await restore();
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const timeAfterVisibilityTrue = performance.now();
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resolve({ timeAfterVisibilityFalse, timeAfterVisibilityTrue });
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});
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});
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// A buffered visibility-state PerformanceEntry would have made this test
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// cleaner, due to the variability of ordering of events, but it is not
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// yet available.
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const visibilityEventPromise = new Promise(resolve => {
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document.addEventListener('visibilitychange', (event) => {
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if (document.visibilityState !== 'visible') {
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resolve(performance.now());
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}
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});
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});
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const timeBeforeTap = performance.now();
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await interactAndObserve('tap', button, observerPromise);
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// The order that these events fire is non-deterministic, but we can await
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// the result of the promise in any order.
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const { timeAfterVisibilityFalse, timeAfterVisibilityTrue } = await tapEventPromise;
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const timeOfVisibilityFalse = await visibilityEventPromise;
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assert_equals(observedEntries.length, 1, "Pointerup was measured");
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const entry = observedEntries[0];
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assert_not_equals(timeBeforeTap, undefined);
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assert_not_equals(timeAfterVisibilityFalse, undefined);
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assert_not_equals(timeAfterVisibilityTrue, undefined);
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assert_not_equals(timeOfVisibilityFalse, undefined);
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assert_less_than(
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entry.processingEnd,
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timeOfVisibilityFalse,
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"event handler ends before visibility event fires"
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);
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assert_less_than(
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timeOfVisibilityFalse,
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timeAfterVisibilityFalse,
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"visibility event fires before event handler continues"
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);
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assert_less_than_equal(
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entry.startTime + entry.duration,
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timeAfterVisibilityFalse,
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"event duration ends before visibility is changed"
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);
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}, "Event handlers which change visibility should not measure next paint.");
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</script>
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</body>
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</html>
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