interactions.html | Explore in Territory

<!DOCTYPE html>
<html>
  <head>
    <script>
        let interactionCallback = () => ({});

        const observer = new PerformanceObserver((list) => {
          for (const entry of list.getEntries()) {
            if (entry.name === 'keydown' || entry.name === 'keyup') {
              interactionCallback();
            }
          }
        });
        observer.observe({type: 'event', buffered: true, durationThreshold: 16});

        window.__interactionPromise = new Promise((resolve) => interactionCallback = resolve)

        const blockMainThread = (event) => {
          // Block the main thread to trigger a PerformanceEventTiming
          // entry, which is only dispatched if the event's duration
          // exceeds the threshold set at the `observe` call.
          // See https://developer.mozilla.org/en-US/docs/Web/API/PerformanceEventTiming
          const threshold = 100;
          const init = performance.now();
          while ((performance.now() - init) < threshold);
        }
    </script>
  </head>
  <body>
    <input autofocus onkeydown="blockMainThread()">
  </body>
</html>

chromium/third_party/blink/web_tests/http/tests/inspector-protocol/resources/interactions.html