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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=388794
+-->
+<head>
+  <title>Test for Bug 388794</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
+  <style>
+    input { padding: 0; margin: 0; border: none; }
+  </style>
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=388794">Mozilla Bug 388794</a>
+<p id="display">
+  <form action="dummy_page.html" target="test1" method="GET">
+    <input id="test1image" type="image" name="testImage">
+  </form>
+  <form action="dummy_page.html" target="test2" method="GET">
+    <input id="test2image" type="image">
+  </form>
+  <form action="dummy_page.html" target="test3" method="GET">
+    <input id="test3image" type="image" src="nnc_lockup.gif" name="testImage">
+  </form>
+  <form action="dummy_page.html" target="test4" method="GET">
+    <input id="test4image" type="image" src="nnc_lockup.gif">
+  </form>
+  <form action="dummy_page.html" target="test5" method="GET">
+    <input id="test5image" type="image" src="nnc_lockup.gif" name="testImage">
+  </form>
+  <form action="dummy_page.html" target="test6" method="GET">
+    <input id="test6image" type="image" src="nnc_lockup.gif">
+  </form>
+  <iframe name="test1" id="test1"></iframe>
+  <iframe name="test2" id="test2"></iframe>
+  <iframe name="test3" id="test3"></iframe>
+  <iframe name="test4" id="test4"></iframe>
+  <iframe name="test5" id="test5"></iframe>
+  <iframe name="test6" id="test6"></iframe>
+</p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for Bug 388794 **/
+SimpleTest.waitForExplicitFinish();
+
+var pendingLoads = 0;
+/* Use regex due to rounding error in Fennec with C++APZ enabled */
+var hrefs = {
+  test1: /\?testImage\.x=0&testImage\.y=0/,
+  test2: /\?x=0&y=0/,
+  test3: /\?testImage\.x=0&testImage\.y=0/,
+  test4: /\?x=0&y=0/,
+  test5: /\?testImage\.x=[4-6]&testImage\.y=[4-6]/,
+  test6: /\?x=[4-6]&y=[4-6]/,
+};
+
+function submitForm(idNum) {
+  $("test"+idNum).setAttribute("onload", "frameLoaded(this)");
+  $("test" + idNum + "image").focus();
+  sendKey("return");
+}
+
+function submitFormMouse(idNum) {
+  $("test"+idNum).setAttribute("onload", "frameLoaded(this)");
+  // Use 4.99 instead of 5 to guard against the possibility that the
+  // image's 'top' is exactly N + 0.5 pixels from the root. In that case
+  // we'd round up the widget mouse coordinate to N + 6, which relative
+  // to the image would be 5.5, which would get rounded up to 6 when
+  // submitting the form. Instead we round the widget mouse coordinate to
+  // N + 5, which relative to the image would be 4.5 which gets rounded up
+  // to 5.
+  synthesizeMouse($("test" + idNum + "image"), 4.99, 4.99, {});
+}
+
+addLoadEvent(function() {
+  // Need the timeout so painting has a chance to be unsuppressed.
+  setTimeout(function() {
+    submitForm(++pendingLoads);
+    submitForm(++pendingLoads);
+    submitForm(++pendingLoads);
+    submitForm(++pendingLoads);
+    submitFormMouse(++pendingLoads);
+    submitFormMouse(++pendingLoads);
+  }, 0);
+});
+
+function frameLoaded(frame) {
+  ok(
+    hrefs[frame.name].test(frame.contentWindow.location.href),
+    "Unexpected href for frame " + frame.name + " - " +
+    "expected to match: " + hrefs[frame.name].toString() + " got: " + frame.contentWindow.location.href
+  );
+  if (--pendingLoads == 0) {
+    SimpleTest.finish();
+  }
+}
+
+</script>
+</pre>
+</body>
+</html>