helper_doubletap_zoom_tallwide.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

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

  <title>Check that double tapping on a tall element that is >90% width of viewport doesn't scroll to the top of it when scrolled down</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() {

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

  var resolution = await getResolution();

  ok(resolution > 0,

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

  // Check that double-tapping once on a small element zooms in

  await doubleTapOn(document.getElementById("target2"), 10, 10, useTouchpad);

  let prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution > prev_resolution, "The first double-tap has increased the resolution to " + resolution);

  // instant scroll to the bottom of the page

  window.scrollTo({

    top: 40000,

    left: 0,

    behavior: 'auto'

});

  await promiseApzFlushedRepaints();

  let scrollPos = window.scrollY;

  ok(scrollPos > 1500, "window scrolled down (1)");

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

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

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

  info("visualViewport.pageTop " + visualViewport.pageTop);

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

  let x = 20;

  let y = visualViewport.pageTop + 20;

  // Check that double-tapping on the big element zooms out

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

  prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution < prev_resolution, "The second double-tap has decreased the resolution to " + resolution);

  info("scrollPos " + scrollPos);

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

  ok(window.scrollY > 1500, "window is still scrolled down (1)");

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

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

  <style>

    .container {

      background-color: #eee;

      width: 95vw;

      height: 400vh;

    .smallcontainer {

      background-color: #aaa;

      width: 40px;

      height: 40px;

</style>

</head>

<body>

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

  <div id="target2" class="smallcontainer">

  </div>

</div>

</body>

</html>