gecko-dev/layout/base/tests/test_maxLineBoxWidth.html

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HTML

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=780258
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 780258</title>
<script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/WindowSnapshot.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
<style>
p {
margin-bottom: 30px;
}
#container {
width: 200px;
}
.box {
position: absolute;
height: 600px;
width: 200px;
border: 1px solid blue;
}
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=780258">Mozilla Bug 780258</a>
<p id="display"></p>
<div id="content" style="display: none">
<div class="box">&nbsp;</div>
<div id="container">
<p>All of this text should be completely contained
within the blue box.
<p>I once knew a man, showed me the sleight of hand.
In the blink of an eye he danced across the strings.
He played a song I've never heard; poignant and absurd;
To this day, it leaves me wondering.
<p>Don't let tomorrow find you wishin'.
Boy, you've got a mission.
Shake it, rattle, and roll.
Now, just use your intuition.
You'll get less competition
from the clock up on the wall.
<p>You are what you are.
You dream what you dream.
Play on your blue guitar for me.
</div>
</div>
<pre id="test">
<script type="application/javascript">
function doChange() {
SpecialPowers.setMaxLineBoxWidth(window, 200);
}
var gFirstBlankSnap;
var gUnchangedContentSnap;
var gIncorrectContentSnap;
var gCorrectContentSnap;
/** Test for Bug 780258 **/
SimpleTest.waitForExplicitFinish();
gFirstBlankSnap = snapshotWindow(window);
// Display our content.
document.getElementById('content').style.display = 'block';
// Take a snapshot.
gUnchangedContentSnap = snapshotWindow(window);
// Verify this isn't the same as the blank snapshot.
var result = compareSnapshots(gFirstBlankSnap, gUnchangedContentSnap, false);
ok(result[0], "content should appear different than blank page");
// Set container width to 350px.
document.getElementById('container').style.width = '350px';
// Take a snapshot.
gIncorrectContentSnap = snapshotWindow(window);
// Verify this is NOT the same as the first content snapshot.
result = compareSnapshots(gUnchangedContentSnap, gIncorrectContentSnap, false);
ok(result[0], "unchanged content should be different than changed content");
// Run the max line box width change.
doChange();
// Take snapshot.
gCorrectContentSnap = snapshotWindow(window);
// Compare snapshots.
result = compareSnapshots(gUnchangedContentSnap, gCorrectContentSnap, true);
ok(result[0], "unchanged content should be the same as corrected content");
// Finish the test.
SimpleTest.finish();
</script>
</pre>
</body>
</html>