test_bug394057.html

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<html lang="en">

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=394057

-->

<head>

  <title>Test for Bug 394057</title>

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

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

  <style type="text/css">

  #display { background: yellow; color: black; font-family: serif; }

  </style>

</head>

<body>

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=394057">Mozilla Bug 394057</a>

<table id="display"><tr><td>MmMmMm...iiiIIIlll---</td></tr></table>

<div id="content" style="display: none">

</div>

<pre id="test">

<script class="testbody" type="text/javascript">

/** Test for Bug 394057 **/

SimpleTest.waitForExplicitFinish();

var tableElement = document.getElementById("display");

var CC = SpecialPowers.Cc;

var CI = SpecialPowers.Ci;

var fe =

  CC["@mozilla.org/gfx/fontenumerator;1"].createInstance(CI.nsIFontEnumerator);

var serifFonts = fe.EnumerateFonts("x-western", "serif");

var monospaceFonts = fe.EnumerateFonts("x-western", "monospace");

function table_width_for_font(font) {

  tableElement.style.fontFamily = '"' + font + '"';

  var result = tableElement.offsetWidth;

  tableElement.style.fontFamily = "";

  return result;

var serifIdx = 0;

var monospaceIdx = 0;

var monospaceWidth, serifWidth;

monospaceWidth = table_width_for_font(monospaceFonts[monospaceIdx]);

for (serifIdx in serifFonts) {

  serifWidth = table_width_for_font(serifFonts[serifIdx]);

  if (serifWidth != monospaceWidth)

    break;

if (serifWidth == monospaceWidth) {

  for (monospaceIdx in monospaceFonts) {

    monospaceWidth = table_width_for_font(monospaceFonts[monospaceIdx]);

    if (serifWidth != monospaceWidth)

      break;

isnot(serifWidth, monospaceWidth,

      "can't find serif and monospace fonts of different width");

SpecialPowers.pushPrefEnv({'set': [['font.name.serif.x-western', serifFonts[serifIdx]]]}).then(step2);

var serifWidthFromPref;

function step2() {

    serifWidthFromPref = tableElement.offsetWidth;

    SpecialPowers.pushPrefEnv({'set': [['font.name.serif.x-western', monospaceFonts[monospaceIdx]]]}).then(step3);

var monospaceWidthFromPref;

function step3() {

    monospaceWidthFromPref = tableElement.offsetWidth;

    is(serifWidthFromPref, serifWidth,

       "changing font pref should change width of table (serif)");

    is(monospaceWidthFromPref, monospaceWidth,

       "changing font pref should change width of table (monospace)");

    SimpleTest.finish();

</script>

</pre>

</body>

</html>