content/base/test/test_bug338679.html

<!DOCTYPE html>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=338679
-->
<head>
<title>Bug 338679: correct reporting of newValue/prevValue in
       DOMAttrModified events</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=338679">Bug
   338679: correct reporting of newValue/prevValue in
   DOMAttrModified events</a>

<div id="test" style="width:20em"></div>

<script>
var testDiv = document.getElementById("test");
var e_new, e_prev = testDiv.getAttribute("style");
var phase, recursive = false;

/* driver */
var tests = [ test_1, test_2, test_3 ];
var i = 0;
function nextTest() {
  if (i < tests.length) {
    phase = tests[i];
    i++;
    phase();
  } else {
    SimpleTest.finish();
  }
}

SimpleTest.waitForExplicitFinish();
testDiv.addEventListener("DOMAttrModified", attr_modified, false);
nextTest();

/* event handler */
function attr_modified(ev) {
  is(ev.newValue, e_new,
     phase.name + (recursive ? " recursive" : "") + ": newValue");
  is(ev.prevValue, e_prev,
     phase.name + (recursive ? " recursive" : "") + ": prevValue");

  e_prev = e_new;
  if (!recursive) {
    recursive = true;
    e_new = "width: 0px;";
    testDiv.style.width = "0";
  } else {
    recursive = false;
    setTimeout(nextTest, 0);
  }
}

/* tests */
function test_1() {
  e_new = "width: auto;";
  testDiv.style.width = "auto";
}

function test_2() {
  e_new = "width: 15%;";
  testDiv.style.width = "15%";
}

function test_3() {
  window.getComputedStyle(testDiv, null).width; // force style resolution
  e_new = "width: inherit;";
  testDiv.style.width = "inherit";
}
</script>
</body>
</html>