helper_doubletap_zoom_hscrollable.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=2100"/>

  <title>Check that tall element wider than the viewport doesn't scroll to the top</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">

// Although this test has hscrollable in the name, it does not test any

// horizontal scrolling. Rather it is the mere presence of horizontally

// scrollable content that triggers this bug (it confused the code that

// picked a rect to zoom to).

async function test() {

  let useTouchpad = (location.search == "?touchpad");

  let resolution = await getResolution();

  ok(resolution > 0,

     "The initial_resolution is " + resolution + ", which is some sane value");

  // instant scroll down

  window.scrollTo({

    top: window.innerHeight * 2,

    left: 0,

    behavior: 'auto'

});

  await promiseApzFlushedRepaints();

  let scrollPos = window.scrollY;

  ok(scrollPos > window.innerHeight * 2 - 50, "window scrolled down");

  info("window.scrollY " + window.scrollY);

  info("window.innerHeight " + window.innerHeight);

  info("document.documentElement.scrollHeight " + document.documentElement.scrollHeight);

  let target = document.getElementById("target");

  let x = 20;

  let y = scrollPos + window.innerHeight / 2;

  // Check that second double tap does not scroll up

  info("sending second double tap");

  await doubleTapOn(target, x, y, useTouchpad);

  prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution == prev_resolution, "After double-tap the resolution is the same: " + resolution);

  ok(window.scrollY > window.innerHeight * 2 - 50, "window is still scrolled down");

  ok(Math.abs(window.scrollY - scrollPos) < 1, "window didnt scroll");

  info("window.scrollY " + window.scrollY);

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

  <style>

    .spacer {

      background-color: #eee;

      height: 800vh;

      width: 200vw;

    .rect {

      width: 90vw;

      height: 30px;

      background-color: #aaa;

</style>

</head>

<body>

<div id="firsttarget" class="rect">

</div>

<div id="target" class="spacer">

</div>

</body>

</html>