test_bug633762.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=633762

-->

<head>

  <title>Test for Bug 633762</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <script src="/tests/SimpleTest/EventUtils.js"></script>

  <script type="text/javascript" src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body>

<p><a target="_blank" href="https://bugzilla.mozilla.org/show_bug?id=633762">Mozilla Bug 633762</a>

<iframe id="i" src="bug633762_iframe.html#a"></iframe>

<pre id="test">

<script>

var doc;

async function runTests() {

  var i = document.getElementById("i");

  doc = i.contentDocument;

  var win = i.contentWindow;

  // set display none on b

  doc.getElementById("b").style.display = "none";

  // flush layout

  doc.documentElement.offsetLeft;

  // focus on the iframe

  win.focus();

  // clear out any potential scroll events so we can listen for the one we want without false positives

  await waitToClearOutAnyPotentialScrolls(window);

  step2();

function step2() {

  var i = document.getElementById("i");

  doc = i.contentDocument;

  var win = i.contentWindow;

  // record scrolltop

  scrollTopBefore = doc.body.scrollTop;

  // send up arrow key event

  sendKey("UP");

  win.addEventListener("scroll", finish, {once: true, capture: true});

function finish() {

  // assert that scroll top is now less than before

  ok(scrollTopBefore > doc.body.scrollTop, "pressing up arrow should scroll up");

  SimpleTest.finish();

var smoothScrollPref = "general.smoothScroll";

SimpleTest.waitForExplicitFinish();

SimpleTest.waitForFocus(function() {

  SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false]]}, runTests);

});

</script>

</pre>

</body>

</html>