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diff --git a/dom/svg/test/test_text_lengthAdjust.html b/dom/svg/test/test_text_lengthAdjust.html
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+++ b/dom/svg/test/test_text_lengthAdjust.html
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+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=569722
+-->
+<head>
+  <meta charset=UTF-8>
+  <title>Test for Bug 569722</title>
+  <script 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=569722">Mozilla Bug 569722</a>
+<p id="display"></p>
+<div id="content">
+  <svg width="400" height="200">
+    <text x="0" y="100" style="font: 16px sans-serif">aaa</text>
+  </svg>
+</div>
+
+<pre id="test">
+<script class="testbody" type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+
+function close(x, y, message) {
+  ok(Math.abs(x - y) < 1e-4, message);
+}
+
+function runTest() {
+  var text = document.querySelector("text");
+
+  // get the original length
+  var length = text.getComputedTextLength();
+
+  // get the original glyph positions
+  var startPositions = [],
+      endPositions = [],
+      extents = [];
+  for (let i = 0; i < 3; i++) {
+    startPositions.push(text.getStartPositionOfChar(i));
+    endPositions.push(text.getEndPositionOfChar(i));
+    extents.push(text.getExtentOfChar(i));
+  }
+
+  // widths should all be the same
+  is(extents[0].width, extents[1].width);
+  is(extents[0].width, extents[2].width);
+
+  var checkCharNumAtPosition = function(x, y, i) {
+    var p = document.querySelector("svg").createSVGPoint();
+    p.x = x;
+    p.y = y;
+    is(text.getCharNumAtPosition(p), i, "getCharNumAtPosition(" + i + ")");
+  };
+
+  var checkPositions = function(start, end, width) {
+    for (let i = 0; i < 3; i++) {
+      // check their positions
+      close(text.getStartPositionOfChar(i).x, start[i], "start position of glyph " + i);
+      close(text.getEndPositionOfChar(i).x, end[i], "end position of glyph " + i);
+      close(text.getExtentOfChar(i).x, start[i], "left edge of extent of glyph " + i);
+      close(text.getExtentOfChar(i).width, width, "width of glyph " + i);
+      checkCharNumAtPosition((start[i] + end[i]) / 2, 100, i);
+    }
+  };
+
+  var w = extents[0].width;
+
+  var doLengthAdjustSpacingTest = function() {
+    // getComputedTextLength should return the sum of the advances, and since
+    // we are just changing the positions of the glyphs, it should be the same
+    // as without a textLength="" attribute
+    close(text.getComputedTextLength(), length, "getComputedTextLength when lengthAdjust=\"spacing\"");
+
+    // expected start and end positions of the glyphs
+    var start = [0, 50 - w / 2, 100 - w];
+    var end = [w, 50 + w / 2, 100];
+    checkPositions(start, end, w);
+  };
+
+  // switch to adjust glyph positions, using the default value of lengthAdjust=""
+  text.setAttribute("textLength", "100");
+  doLengthAdjustSpacingTest();
+  // then with an explicit lengthAdjust="spacing"
+  text.setAttribute("lengthAdjust", "spacing");
+  doLengthAdjustSpacingTest();
+
+  // now test with lengthAdjust="spacingAndGlyphs"
+  text.setAttribute("lengthAdjust", "spacingAndGlyphs");
+
+  // now that each glyph is stretched, the total advance should be the textLength
+  close(text.getComputedTextLength(), 100, "getComputedTextLength when lengthAdjust=\"spacingAndGlyphs\"");
+
+  // expected start and end positions of the glyphs
+  var start = [0, 33.3333, 66.6666];
+  var end = [33.3333, 66.6666, 100];
+  checkPositions(start, end, 33.3333);
+
+  SimpleTest.finish();
+}
+
+window.addEventListener("load", runTest);
+</script>
+</pre>
+</body>
+</html>