unlock_top_items.html | Explore in Territory

<!doctype HTML>

<!--
This test appends 30,000 locked items to the page. It then unlocks items
starting from the top one and measures the length of requestAnimationFrame.

The test works with and without display locking. However, without display
locking, this simply measures requestAnimationFrame.
-->

<head>
<script src="../resources/runner.js"></script>
<style>
.container {
  contain: style layout;
  content-size: 100px;
}
.box {
  background: blue;
  overflow: hidden;
  width: 100%;
  height: 100px;
}
</style>
</head>

<body>
<!-- node template from which to construct items -->
<template id="node_template">
<div class="container">
  Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  Quisque ante dui, posuere at pretium suscipit, condimentum at augue.
  <div class="box">
    Lorem ipsum dolor sit amet, consectetur adipiscing elit.
    Quisque ante dui, posuere at pretium suscipit, condimentum at augue.
  </div>
  Lorem ipsum dolor sit amet, consectetur adipiscing elit.
  Quisque ante dui, posuere at pretium suscipit, condimentum at augue.
</div>
</template>
</body>

<script>
function construct(n) {
  const specimen = document.importNode(
    document.getElementById("node_template").content, true).firstElementChild;
  for (let i = 0; i < n; ++i) {
    const clone = specimen.cloneNode(true);
    clone.id = "id" + i;
    clone.hidden = 'until-found';
    document.body.appendChild(clone);
  }
}

let nextId = 0;
function commitNextLock() {
  const element = document.getElementById("id" + nextId);
  ++nextId;
  element.style = "";
}

let testDone = false;
let startTime;
function runTest() {
  if (startTime) {
    PerfTestRunner.measureValueAsync(PerfTestRunner.now() - startTime);
    PerfTestRunner.addRunTestEndMarker();
  }
  if (testDone)
    return;

  startTime = PerfTestRunner.now();
  PerfTestRunner.addRunTestEndMarker();

  commitNextLock();
  requestAnimationFrame(runTest);
}

construct(30000);

PerfTestRunner.startMeasureValuesAsync({
  unit: 'ms',
  done: () => { testDone = true; },
  run: runTest,
  warmUpCount: 1,
  iterationCount: 5
});

</script>
chromium/third_party/blink/perf_tests/display_locking/unlock_top_items.html
