helper_overscroll_behavior_bug1494440.html

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<head>

  <meta name="viewport" content="width=device-width; initial-scale=1.0">

  <title>Inactive iframe with overscroll-behavior</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>

</head>

<body>

  <iframe id="scroll" srcdoc="<!doctype html><html style='overscroll-behavior:none; overflow: auto;'><div style='width:100px;height:2000px;'>">

  </iframe>

  <div style="height: 5000px;"></div><!-- So the page is scrollable as well -->

  <script type="application/javascript">

async function test() {

  var iframe = document.getElementById("scroll");

  var iframeWindow = iframe.contentWindow;

  // scroll the iframe to the bottom, such that a subsequent scroll on it

  // _would_ hand off to the page if overscroll-behavior allowed it

  iframeWindow.scrollTo(0, iframeWindow.scrollMaxY);

  await promiseApzFlushedRepaints();

  is(iframeWindow.scrollY, iframeWindow.scrollMaxY, "iframe has scrolled to the bottom");

  // Scroll over the iframe, and make sure that the page

  // does not scroll.

  // We can't wait for a "scroll" event unconditionally, since if the platform

  // behaviour we are testing is correct (overscroll-behavior is respected),

  // one will never arrive.

  var waitForScroll = false;

  await promiseMoveMouseAndScrollWheelOver(iframeWindow, 100, 100, waitForScroll);

  // However, we need to give a potential "scroll" event a chance to be dispatched,

  // so that if the platform behaviour we are testing is incorrect (overscroll-behavior)

  // is not respected, we catch it.

  await promiseApzFlushedRepaints();

  is(window.scrollY, 0, "overscroll-behavior was respected");

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

  <style>

    #scroll {

      width: 200px;

      height: 500px;

  </style>

</body>