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diff --git a/layout/generic/test/file_bug514732_helper.html b/layout/generic/test/file_bug514732_helper.html
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+++ b/layout/generic/test/file_bug514732_helper.html
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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=514732
+-->
+<head>
+  <title>Test for Bug 514732</title>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug?id=514732">Mozilla Bug 514732</a>
+
+<div id="imgs" style="whitespace: nowrap; overflow: visible; height: 10px;"></div>
+
+<iframe id="testframe" src="./file_bug514732_1.html"></iframe>
+
+<br/><br/>
+<div id="log">log:<br/></div>
+<br/><br/>
+
+<script class="testbody" style="width: 300; height: 150;" type="text/javascript;version=1.8">
+// Import test API
+var is = window.opener.is;
+var ok = window.opener.ok;
+var todo = window.opener.todo;
+var finish = window.opener.SimpleTest.finish;
+
+function log(msg) {
+  document.getElementById("log").innerHTML += msg;
+}
+
+function logln(msg) {
+  if (arguments.length == 0) msg = "";
+  document.getElementById("log").innerHTML += msg + "<br/>";
+}
+
+function logev(ev) {
+  logln([ev.x, ev.y, ev.width, ev.height].join(' '));
+}
+
+/* Absolutely position a 500x500 div at x, y on doc */
+function phoom(doc, x, y) {
+  var d = doc.createElement('div');
+  d.id = "phoomer";
+  d.style.position = "absolute";
+  d.style.left = x + 'px';
+  d.style.top = y + 'px';
+  d.style.backgroundColor = "#00FFF0";
+  d.style.width = 500 + 'px';
+  d.style.height = 500 + 'px';
+  doc.getElementById('imgs').appendChild(d);
+}
+
+function unphoom(doc) {
+  var phoomer = doc.getElementById('phoomer');
+  if (phoomer)
+    doc.getElementById('imgs').removeChild(phoomer);
+}
+
+function getDocBodyDimensions(doc) {
+  return [doc.documentElement.scrollWidth, doc.documentElement.scrollHeight];
+}
+
+function makeResult() {
+  return {
+    success: false,
+    event: null
+  };
+}
+
+function makeListener(result, eventGen) {
+  return function(ev) {
+    result.success = true;
+    result.event = ev;
+    setTimeout(function() { eventGen.next(); }, 0);
+  };
+}
+
+function waitInterrupt(result, gen) {
+  result.event = null;
+  result.success = false;
+  setTimeout(function() { if (!result.success) gen.next(); }, 3500);
+}
+
+function testPhoom(isCapturing, x, y, expectEvent) {
+
+  var eventGen = (function() {
+    var innerdoc = document.getElementById('testframe').contentDocument;
+
+    for (var doc of [document, innerdoc]) {
+      var inner = (doc == innerdoc);
+      var w, h, result, listener;
+
+      /* --- EXPANSION --- */
+
+      result = makeResult();
+      listener = makeListener(result, eventGen);
+
+      doc.addEventListener("MozScrolledAreaChanged", listener, isCapturing);
+
+      if (!expectEvent) waitInterrupt(result, eventGen);
+      phoom(doc, x, y);
+      yield;
+
+      doc.removeEventListener("MozScrolledAreaChanged", listener, isCapturing);
+
+      /* If we're expecting an event, better check that we got one.  If we are not expecting one,
+         one can still arrive, but we don't complain if it did not.  In either case, any event
+         that arrives will have its data checked below. */
+      if (expectEvent) {
+        ok(result.success, "Received expected " + (inner ? "inner" : "") + " expansion event");
+      }
+
+      if (result.success) {
+        is(result.event.x, 0, "Expansion event x is 0");
+        is(result.event.y, 0, "Expansion event y is 0");
+        if (inner) {
+          /* In iframe-land, the values of |myiframe.contentDocument.documentElement.scrollWidth| and
+             |.scrollHeight| appear to be not as expected (they stay very small).  This is fine, since
+             we know exactly where we're positioning our fixed-dimensions div, and we know our iframe's
+             dimensions, so we can do our own math.  NB: The inner iframe is styled at 300x500. */
+          is(Math.round(result.event.width),
+             Math.max(x + 500, 300),
+             "Inner expansion event width matches body width");
+          is(Math.round(result.event.height),
+             Math.max(y + 500, 150),
+             "Inner expansion event height matches body height");
+        } else {
+          [w, h] = getDocBodyDimensions(doc);
+          is(Math.round(result.event.width),  w, "Expansion event width matches body width");
+          is(Math.round(result.event.height), h, "Expansion event height matches body height");
+        }
+      }
+
+      /* --- CONTRACTION --- */
+
+      result = makeResult();
+      listener = makeListener(result, eventGen);
+
+      doc.addEventListener("MozScrolledAreaChanged", listener, isCapturing);
+
+      if (!expectEvent) waitInterrupt(result, eventGen);
+      unphoom(doc);
+      yield;
+
+      doc.removeEventListener("MozScrolledAreaChanged", listener, isCapturing);
+
+      if (expectEvent) {
+        ok(result.success, "Received expected " + (inner ? "inner" : "") + " contraction event");
+      }
+
+      if (result.success) {
+        is(result.event.x, 0, "Contraction event x is 0");
+        is(result.event.y, 0, "Contraction event y is 0");
+        if (inner) {
+          is(Math.round(result.event.width),  300, "Inner contraction event width matches body width");
+          is(Math.round(result.event.height), 150, "Inner contraction event height matches body height");
+        } else {
+          [w, h] = getDocBodyDimensions(doc);
+          is(Math.round(result.event.width),  w, "Contraction event width matches body width");
+          is(Math.round(result.event.height), h, "Contraction event height matches body height");
+        }
+      }
+    }
+
+    setTimeout(nextTest, 0);
+
+    yield;
+  })();
+
+  setTimeout(function() { eventGen.next(); }, 0);
+}
+
+function testPreliminaries() {
+  /* Do any setup here */
+  nextTest();
+}
+
+function testEventCapturingHorz() {
+  testPhoom(true, 10000, 0, true); // calls nextTest() when finished
+}
+
+function testEventCapturingVert() {
+  testPhoom(true, 0, 10000, true); // calls nextTest() when finished
+}
+
+function testEventCapturingBoth() {
+  testPhoom(true, 10000, 10000, true); // calls nextTest() when finished
+}
+
+function testEventCapturingNegv() {
+  testPhoom(true, -10000, -10000, false); // calls nextTest() when finished
+}
+
+function testEventBubblingHorz() {
+  testPhoom(false, 10000, 0, true); // calls nextTest() when finished
+}
+
+function testEventBubblingVert() {
+  testPhoom(false, 0, 10000, true); // calls nextTest() when finished
+}
+
+function testEventBubblingBoth() {
+  testPhoom(false, 10000, 10000, true); // calls nextTest() when finished
+}
+
+function testEventBubblingNegv() {
+  testPhoom(false, -10000, -10000, false); // calls nextTest() when finished
+}
+
+function testCustomCreationHelper(creatingDoc, listeningDoc, x, y, w, h, expectEvent) {
+  var result = makeResult();
+
+  var listener = function(evt) {
+    result.success = true;
+    result.event = evt;
+  };
+
+  var ev = creatingDoc.createEvent("ScrollAreaEvent");
+  ev.initScrollAreaEvent("MozScrolledAreaChanged",
+                         true, true, window, 0,
+                         x, y, w, h);
+
+  listeningDoc.addEventListener("MozScrolledAreaChanged", listener, true);
+
+  result.success = false;
+  creatingDoc.dispatchEvent(ev);
+
+  listeningDoc.removeEventListener("MozScrolledAreaChanged", listener, true);
+
+  is(result.success, expectEvent, "Received custom event iff expected");
+  if (result.success) {
+    is(result.event.x,      x, "Custom event data matches for x");
+    is(result.event.y,      y, "Custom event data matches for y");
+    is(result.event.width,  w, "Custom event data matches for width");
+    is(result.event.height, h, "Custom event data matches for height");
+  }
+}
+
+function testCustomCreation() {
+  var innerdoc = document.getElementById('testframe').contentDocument;
+  testCustomCreationHelper(document, document, 2, 7, 1, 8, true);  // e = 2.718 ...
+  testCustomCreationHelper(innerdoc, innerdoc, 2, 8, 1, 8, true);  //  ... 2818 ...
+  testCustomCreationHelper(innerdoc, document, 2, 8, 4, 5, false); //  ... 2845 ...
+  nextTest();
+}
+
+var TESTS = [testPreliminaries,
+             testEventCapturingHorz,
+             testEventCapturingVert,
+             testEventCapturingBoth,
+             testEventCapturingNegv,
+             testEventBubblingHorz,
+             testEventBubblingVert,
+             testEventBubblingBoth,
+             testEventBubblingNegv,
+             testCustomCreation,
+              __end];
+
+var PC = 0;
+
+function nextTest() {
+  TESTS[PC++]();
+}
+
+function __end() {
+  log("done!");
+  finish();
+  window.close();
+}
+
+/*
+ * We need both the parent document and all iframe documents to load
+ * before starting anything
+ */
+var loaded = 0;
+
+window
+.addEventListener('load', function(ev) {
+  logln(++loaded);
+  if (loaded >= 2) {
+    logln("go...");
+    nextTest();
+  }
+}, false);
+
+document.getElementById("testframe").contentWindow
+.addEventListener('load', function(ev) {
+  logln(++loaded);
+  if (loaded >= 2) {
+    logln("go...");
+    nextTest();
+  }
+}, false);
+
+// window.opener says: SimpleTest.waitForExplicitFinish();
+
+</script>
+
+</body>
+</html>