event-click-visibilitychange.html

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This WPT test may be referenced by the following Test IDs:
- /event-timing/event-click-visibilitychange.html - WPT Dashboard Interop Dashboard

<!DOCTYPE html>

<html>

<meta charset=utf-8 />

<meta name="timeout" content="long">

<title>Event Timing: visibility change.</title>

<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/testdriver-actions.js></script>

<script src=/page-visibility/resources/window_state_context.js></script>

<script src=resources/event-timing-test-utils.js></script>

<body>

  <button id='target'>Click me</button>

  <script>

    let observedEntries = [];

    const map = new Map();

    const events = ['pointerup'];

    promise_test(async t => {

      assert_implements(window.PerformanceEventTiming, 'Event Timing is not supported.');

      const { minimize, restore } = window_state_context(t);

      const button = document.getElementById('target');

      const callback = (entryList) => { observedEntries = observedEntries.concat(entryList.getEntries().filter(filterAndAddToMap(events, map))); };

      const readyToResolve = () => { return observedEntries.length >= 1; };

      const observerPromise = createPerformanceObserverPromise(['event'], callback, readyToResolve);

      const tapEventPromise = new Promise(resolve => {

        button.addEventListener('pointerup', async (event) => {

          document.body.innerText += "Adding content to force rendering";

          // await here will yield to event loop, and end event processing time,

          // which will allow rendering to continue.

          // The visibility change may happen before rendering has a chance

          // but it is not guarenteed which will happen first.

          await minimize();

          const timeAfterVisibilityFalse = performance.now();

          await restore();

          const timeAfterVisibilityTrue = performance.now();

          resolve({ timeAfterVisibilityFalse, timeAfterVisibilityTrue });

});

});

      // A buffered visibility-state PerformanceEntry would have made this test

      // cleaner, due to the variability of ordering of events, but it is not

      // yet available.

      const visibilityEventPromise = new Promise(resolve => {

        document.addEventListener('visibilitychange', (event) => {

          if (document.visibilityState !== 'visible') {

            resolve(performance.now());

});

});

      const timeBeforeTap = performance.now();

      await interactAndObserve('tap', button, observerPromise);

      // The order that these events fire is non-deterministic, but we can await

      // the result of the promise in any order.

      const { timeAfterVisibilityFalse, timeAfterVisibilityTrue } = await tapEventPromise;

      const timeOfVisibilityFalse = await visibilityEventPromise;

      assert_equals(observedEntries.length, 1, "Pointerup was measured");

      const entry = observedEntries[0];

      assert_not_equals(timeBeforeTap, undefined);

      assert_not_equals(timeAfterVisibilityFalse, undefined);

      assert_not_equals(timeAfterVisibilityTrue, undefined);

      assert_not_equals(timeOfVisibilityFalse, undefined);

      assert_less_than(

        entry.processingEnd,

        timeOfVisibilityFalse,

        "event handler ends before visibility event fires"

);

      assert_less_than(

        timeOfVisibilityFalse,

        timeAfterVisibilityFalse,

        "visibility event fires before event handler continues"

);

      assert_less_than_equal(

        entry.startTime + entry.duration,

        timeAfterVisibilityFalse,

        "event duration ends before visibility is changed"

);

    }, "Event handlers which change visibility should not measure next paint.");

  </script>

</body>

</html>