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Test Info: Warnings

  • This test gets skipped with pattern: toolkit == 'android'
<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; }
<a target="_blank" href="">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.insertBefore(e, sib);
function get_pref()
return SpecialPowers.getBoolPref("layout.css.visited_links_enabled");
function snapshotsEqual(snap1, snap2)
return compareSnapshots(snap1, snap2, true)[0];
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 =;
// 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 =;
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
setTimeout(step3, timeout);
function step3()
var snapshot = snapshotWindow(subwin, false);
ok(snapshotsEqual(unvisref, snapshot),
":visited selector does not apply given false preference");