author Sebastian Hengst <>
Sun, 05 Feb 2023 13:12:06 +0100
changeset 651755 2e6262a410b7c25a3a7349825a7367462d4420fa
parent 616557 918ef225713fa9fc188f42355a6cd4a2bfb3b64c
permissions -rw-r--r--
Bug 1815090 - regenerate certificates in build/pgo/certs/. a=me * the build/pgo/certs/ changes were made using `./mach python build/pgo/`

  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width; initial-scale=1.0">
  <title>Sanity touch-tapping test</title>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
  <script type="application/javascript">

async function test() {
  while (window.scrollY == 0) {
    // the scrollframe is not yet marked as APZ-scrollable. Mark it so
    // before continuing.
    window.scrollTo(0, 1);
    await promiseApzFlushedRepaints();

  // This is a scroll by 20px that should use paint-skipping if possible.
  // If paint-skipping is enabled, this should not trigger a paint, but go
  // directly to the compositor using an empty transaction. We check for this
  // by ensuring the document element did not get painted.
  var utils = window.opener.SpecialPowers.getDOMWindowUtils(window);
  var elem = document.documentElement;
  var skipping = == "?true";
  window.scrollTo(0, 20);
  await promiseAllPaintsDone();

  if (skipping) {
    is(utils.checkAndClearPaintedState(elem), false, "Document element didn't get painted");

  // After that's done, we click on the button to make sure the
  // skipped-paint codepath still has working APZ event transformations.
  let clickPromise = new Promise(resolve => {
    document.addEventListener("click", resolve);

  await synthesizeNativeTap(document.getElementById("b"), 5, 5, function() {
    dump("Finished synthesizing tap, waiting for button to be clicked...\n");

  let clickEvent = await clickPromise;
  is(, document.getElementById("b"), "Clicked on button, yay! (at " + clickEvent.clientX + "," + clickEvent.clientY + ")");

  .then(subtestDone, subtestFailed);

<body style="height: 5000px">
 <div style="height: 50px">spacer</div>
 <button id="b" style="width: 10px; height: 10px"></button>