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DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=319381
-->
<head>
  <title>Test for Bug 319381</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>        
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=319381">Mozilla Bug 319381</a>
<p id="display"></p>
<div id="content" style="display: none">
  <div id="t"></div>  
</div>
<pre id="test">
<script class="testbody" type="text/javascript">

/** Test for Bug 319381 **/

function c() {
  return document.defaultView.getComputedStyle($('t'), "").
    getPropertyValue("overflow");
}

function cval() {
  return document.defaultView.getComputedStyle($('t'), "").
    getPropertyCSSValue("overflow");
}

var vals = ["visible", "hidden", "auto", "scroll"];
var mozVals = ["-moz-scrollbars-vertical", "-moz-scrollbars-horizontal"];
var i, j;

for (i = 0; i < vals.length; ++i) {
  $('t').style.overflow = vals[i];
  is($('t').style.overflow, vals[i], "Roundtrip");
  is(c(), vals[i], "Simple property set");
  isnot(cval(), null, "Simple property as CSSValue");
}

$('t').style.overflow = mozVals[0];
is($('t').style.getPropertyValue("overflow-y"), "scroll", "Roundtrip");
is($('t').style.getPropertyValue("overflow-x"), "hidden", "Roundtrip");
is($('t').style.overflow, "", "Shorthand read directly");
is(c(), "", "Shorthand computed");
is(cval(), null, "Shorthand as CSSValue");

$('t').style.overflow = mozVals[1];
is($('t').style.getPropertyValue("overflow-x"), "scroll", "Roundtrip");
is($('t').style.getPropertyValue("overflow-y"), "hidden", "Roundtrip");
is($('t').style.overflow, "", "Shorthand read directly");
is(c(), "", "Shorthand computed");
is(cval(), null, "Shorthand as CSSValue");

for (i = 0; i < vals.length; ++i) {
  for (j = 0; j < vals.length; ++j) {
    $('t').setAttribute("style",
                        "overflow-x: " + vals[i] + "; overflow-y: " + vals[j]);
    is($('t').style.getPropertyValue("overflow-x"), vals[i], "Roundtrip");
    is($('t').style.getPropertyValue("overflow-y"), vals[j], "Roundtrip");

    if (i == j) {
      is($('t').style.overflow, vals[i], "Shorthand serialization");
    } else {
      is($('t').style.overflow, "", "Shorthand serialization");
    }

    // "visible" overflow-x and overflow-y become "auto" in computed style if
    // the other direction is not also "visible".
    if (i == j || (vals[i] == "visible" && vals[j] == "auto")) {
      is(c(), vals[j], "Shorthand computation");
      isnot(cval(), null, "Shorthand computation as CSSValue");
    } else if (vals[j] == "visible" && vals[i] == "auto") {
      is(c(), vals[i], "Shorthand computation");
      isnot(cval(), null, "Shorthand computation as CSSValue");    
    } else {
      is(c(), "", "Shorthand computation");
      is(cval(), null, "Shorthand computation as CSSValue");
    }
  }
}

</script>
</pre>
</body>
</html>