high-priority-input-click.html | Explore in Territory

<!doctype html>
<title>Blink Scheduler Prioritize Input - Click</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/utils.js"></script>

<h1>Test Page</h1>
<button id=button>Click me!</button>

<script>
'use strict';

window.onload = () => {
  promise_test(async t => {
    const taskCountDuringInputEvent = await new Promise(async resolve => {
      let taskCount = 0;
      const blockingTask = () => {
        ++taskCount;
        spin(50);
      };

      const button = document.getElementById('button');
      button.addEventListener('pointerdown', () => {
        resolve(taskCount);
      });

      await requestAnimationFramePromise();
      await scheduler.yield();

      const controller = new TaskController({priority: "user-blocking"});
      t.add_cleanup(() => controller.abort());

      for (let i = 0; i < 50; i++) {
        const p = scheduler.postTask(blockingTask, {signal: controller.signal});
        ignoreUnhandledRejection(p);
        const id = setTimeout(blockingTask, 0);
        t.add_cleanup(() => clearTimeout(id));
      }

      test_driver.click(button);
    });

    // There's lag in sending the event from test_driver, so we need to be careful
    // races with the other scheduled tasks. Conservatively using 10 (500 ms)
    // should be sufficient for a regression test, esepcially with tighter bounds
    // in the keyboard version of this test.
    assert_less_than_equal(taskCountDuringInputEvent, 10);
  }, 'Test that pointer input is prioritized');
};

</script>
chromium/third_party/blink/web_tests/wpt_internal/scheduler/integration_tests/high-priority-input-click.html
