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diff --git a/dom/svg/test/test_SVGPathSegList.xhtml b/dom/svg/test/test_SVGPathSegList.xhtml
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+++ b/dom/svg/test/test_SVGPathSegList.xhtml
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+<html xmlns="http://www.w3.org/1999/xhtml">
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=611138
+-->
+<head>
+  <title>Generic tests for SVG animated length lists</title>
+  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
+  <script type="text/javascript" src="MutationEventChecker.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=611138">Mozilla Bug 611138</a>
+<p id="display"></p>
+<div id="content" style="display:none;">
+<svg id="svg" xmlns="http://www.w3.org/2000/svg" width="100" height="100">
+  <path id="path"/>
+</svg>
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+<![CDATA[
+
+SimpleTest.waitForExplicitFinish();
+
+/*
+This file runs a series of SVGPathSegList specific tests. Generic SVGXxxList
+tests can be found in test_SVGxxxList.xhtml. Anything that can be generalized
+to other list types belongs there.
+*/
+
+function run_tests()
+{
+  document.getElementById('svg').pauseAnimations();
+
+  var d;
+  var seg;
+  var path = document.getElementById("path");
+  var list = path.pathSegList;
+
+  // See https://bugzilla.mozilla.org/show_bug.cgi?id=611138
+  // Here we are doing a replace with a segment (arc) that has more arguments
+  // than the total number of arguments in the entire path + 2 (the +2
+  // refering to the encoding of the segment types for the two segments).
+  path.setAttribute('d', 'M0,0 L100,100');
+  var arc = path.createSVGPathSegArcAbs(400, 0, 200, 200, 0, 1, 1);
+  list.replaceItem(arc, 1);
+
+  is(list.numberOfItems, 2, 'The length of the list should be the same after a valid replaceItem() call');
+  is(list.getItem(1), arc, 'The inserted object should now be the object at the index being replaced');
+
+  // Test whether and when we normalize the 'd' attribute:
+
+  d = "  \n  M  10  ,  10  \n  L  20  10  \n  ";
+  path.setAttribute('d', d);
+  is(path.getAttribute('d'), d, "Values passed to setAttribute for the 'd' attribute should not be normalised");
+  list.getItem(1).y = 20;
+  isnot(path.getAttribute('d'), d, "The 'd' attribute should change when its underlying DOM list changes");
+
+  // Test that path manipulations still work even when the path is invalid due
+  // to it not starting with a moveto segment:
+
+  path.setAttribute('d', 'M0,0 L1,1');
+  is(list.numberOfItems, 2, 'setAttribute should result in two items')
+
+  seg = list.getItem(1);
+  list.removeItem(0);
+  ok(list.numberOfItems == 1 && list.getItem(0) == seg,
+    'If removeItem removes the initial moveto leaving an invalid path, the other items should still be left in the list')
+
+  seg = path.createSVGPathSegLinetoAbs(1, 2);
+  list.appendItem(seg);
+  ok(list.numberOfItems == 2 && list.getItem(1) == seg,
+    'appendItem should be able to append to an invalid path');
+
+  seg = path.createSVGPathSegLinetoAbs(1, 2);
+  list.replaceItem(seg, 1);
+  ok(list.numberOfItems == 2 && list.getItem(1) == seg,
+    'replaceItem should be able to replace items in an invalid path');
+
+  seg = path.createSVGPathSegLinetoAbs(1, 2);
+  list.insertItemBefore(seg, 1);
+  ok(list.numberOfItems == 3 && list.getItem(1) == seg,
+    'insertItemBefore should be able insert items into an invalid path');
+
+  seg = path.createSVGPathSegLinetoAbs(1, 2);
+  list.initialize(seg);
+  ok(list.numberOfItems == 1 && list.getItem(0) == seg,
+    'initialize should be able initialize an invalid path with a non-moveto item');
+
+  // Test mutation events
+
+  eventChecker = new MutationEventChecker;
+  d = 'M0,0 L12,34'
+  path.setAttribute('d', d);
+  eventChecker.watchAttr(path, "d");
+
+  // -- Actual changes
+  eventChecker.expect("modify modify modify");
+  list[0].x = 10;
+  list[0].y = 5;
+  path.setAttribute("d", "M20,5 L12,34");
+
+  // -- Redundant changes
+  eventChecker.expect("");
+  list[0].x = 20;
+  list[1].y = 34;
+  path.setAttribute("d", "M20,5 L12,34");
+
+  // -- Attribute removal
+  eventChecker.expect("remove");
+  path.removeAttribute("d");
+
+  // -- Non-existent attribute removal
+  eventChecker.expect("");
+  path.removeAttribute("d");
+  path.removeAttributeNS(null, "d");
+  eventChecker.finish();
+
+  SimpleTest.finish();
+}
+
+window.addEventListener("load", run_tests, false);
+
+]]>
+</script>
+</pre>
+</body>
+</html>