test_visited_pref.html

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<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=147777

-->

<head>

  <title>Test for visited link coloring pref Bug 147777</title>

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

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

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

  <style type="text/css">

  :link { float: left; }

  :visited { float: right; }

  </style>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=147777">Mozilla Bug 147777</a>

<iframe id="iframe" src="visited-pref-iframe.html" style="width: 10em; height: 5em"></iframe>

<pre id="test">

<script type="application/javascript">

/** Test for Bug 147777 **/

function reinsert_node(e) {

  var sib = e.nextSibling;

  var par = e.parentNode;

  par.removeChild(e);

  par.insertBefore(e, sib);

function get_pref()

    return SpecialPowers.getBoolPref("layout.css.visited_links_enabled");

function snapshotsEqual(snap1, snap2)

  return compareSnapshots(snap1, snap2, true)[0];

SimpleTest.waitForExplicitFinish();

SimpleTest.requestFlakyTimeout("untriaged");

window.addEventListener("load", step1);

var iframe, subdoc, subwin;

var link;

var start;

var timeout;

var unvisref; // reference image for unvisited style

function step1()

  is(get_pref(), true, "pref defaults to true");

  iframe = document.getElementById("iframe");

  subdoc = iframe.contentDocument;

  subwin = iframe.contentWindow;

  link = subdoc.getElementById("link");

  unvisref = snapshotWindow(subwin, false);

  // Now set the href of the link to a location that's actually visited.

  link.href = top.location;

  start = Date.now();

  // And wait for the link to get restyled when the history lets us

  // know it is (asynchronously).

  setTimeout(poll_for_visited_style, 100);

function poll_for_visited_style()

  var snapshot = snapshotWindow(subwin, false);

  if (snapshotsEqual(unvisref, snapshot)) {

    // hasn't been styled yet

    setTimeout(poll_for_visited_style, 100);

    // If it never gets styled correctly, this test will fail because

    // this loop will never complete.

  } else {

    var end = Date.now();

    timeout = 3 * Math.max(end - start, 300);

    SpecialPowers.pushPrefEnv({"set":[["layout.css.visited_links_enabled", false]]}, step2);

function step2()

  // we don't handle dynamic changes of this pref; it only takes effect

  // when a new page loads

  reinsert_node(link);

  setTimeout(step3, timeout);

function step3()

  var snapshot = snapshotWindow(subwin, false);

  ok(snapshotsEqual(unvisref, snapshot),

     ":visited selector does not apply given false preference");

  SimpleTest.finish();

</script>

</pre>

</body>

</html>