helper_scrollto_tap.html

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<!DOCTYPE HTML>

<html>

<head>

  <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 = location.search == "?true";

  utils.checkAndClearPaintedState(elem);

  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(clickEvent.target, document.getElementById("b"), "Clicked on button, yay! (at " + clickEvent.clientX + "," + clickEvent.clientY + ")");

waitUntilApzStable()

  .then(test)

  .then(subtestDone, subtestFailed);

  </script>

</head>

<body style="height: 5000px">

 <div style="height: 50px">spacer</div>

 <button id="b" style="width: 10px; height: 10px"></button>

</body>

</html>