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diff --git a/layout/forms/test/test_textarea_resize.html b/layout/forms/test/test_textarea_resize.html
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+++ b/layout/forms/test/test_textarea_resize.html
@@ -0,0 +1,102 @@
+<!DOCTYPE HTML>
+<html>
+<head>
+  <title>Test for Bug 477700</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"/>
+</head>
+<body>
+<div id="content" style="display: none">
+</div>
+
+<textarea id="textarea" style="-moz-appearance: none; border: 2px solid black; padding: 3px; box-sizing: border-box; min-width: 15px; min-height: 15px;">Text</textarea>
+
+<pre id="test">
+<script type="application/javascript">
+
+/** Test for textbox resizing **/
+SimpleTest.waitForExplicitFinish();
+addLoadEvent(() => SimpleTest.executeSoon(doTheTest));
+
+// -1 means use the default value which is 'both', then test explicitly
+// setting each possible value.
+var currentResize = -1;
+var currentBoxSizing = 0;
+var currentPointer = 0;
+var resizeTypes = [ "horizontal", "vertical", "none", "inherit", "both" ];
+var boxSizingTypes = [ "", "border-box" ];
+var pointerTypes = [ synthesizeMouse, synthesizeTouch]
+
+function doTheTest() {
+  runTest(pointerTypes[currentPointer]);
+}
+
+function runTest(aPointerFunc) {
+  var boxSizingText = " with box sizing " + (currentBoxSizing ? boxSizingTypes[currentBoxSizing] : "content-box");
+
+  var textarea = $("textarea");
+  var rect = textarea.getBoundingClientRect();
+  var touch = aPointerFunc.name.match(/Touch/);
+  // -1 means use the default value of resize, i.e. "both"
+  var type = (currentResize == -1) ? "both" : resizeTypes[currentResize];
+  // assume that the resizer is in the lower right corner
+
+  aPointerFunc(textarea, rect.width - 10, rect.height - 10, { type: touch ? "touchstart" : "mousedown" });
+  aPointerFunc(textarea, rect.width + 40, rect.height + 40, { type: touch ? "touchmove" : "mousemove" });
+
+  var newrect = textarea.getBoundingClientRect();
+  var hchange = (type == "both" || type == "horizontal");
+  var vchange = (type == "both" || type == "vertical");
+
+  is(Math.round(newrect.width), Math.round(rect.width + (hchange ? 50 : 0)),
+     type + " width has increased" + boxSizingText + " using " + aPointerFunc.name);
+  is(Math.round(newrect.height), Math.round(rect.height + (vchange ? 50 : 0)),
+     type + " height has increased" + boxSizingText + " using " + aPointerFunc.name);
+
+  aPointerFunc(textarea, rect.width - 20, rect.height - 20, { type: touch ? "touchmove" : "mousemove" });
+
+  newrect = textarea.getBoundingClientRect();
+
+  is(Math.round(newrect.width), Math.round(rect.width - (hchange ? 10 : 0)),
+     type + " width has decreased" + boxSizingText + " using " + aPointerFunc.name);
+  is(Math.round(newrect.height), Math.round(rect.height - (vchange ? 10 : 0)),
+     type + " height has decreased" + boxSizingText + " using " + aPointerFunc.name);
+
+  aPointerFunc(textarea, rect.width - 220, rect.height - 220, { type: touch ? "touchmove" : "mousemove" });
+
+  newrect = textarea.getBoundingClientRect();
+  ok(hchange ? newrect.width >= 15 : Math.round(newrect.width) == Math.round(rect.width),
+     type + " width decreased below minimum" + boxSizingText + " using " + newrect.width);
+  ok(vchange ? newrect.height >= 15 : Math.round(newrect.height) == Math.round(rect.height),
+     type + " height decreased below minimum" + boxSizingText + " using " + aPointerFunc.name);
+
+  aPointerFunc(textarea, rect.width - 8, rect.height - 8, { type: touch ? "touchend" : "mouseup" });
+
+  textarea.style.width = "auto";
+  textarea.style.height = "auto";
+
+  if (currentBoxSizing++ <= boxSizingTypes.length) {
+    textarea.style.MozBoxSizing = boxSizingTypes[currentBoxSizing];
+    SimpleTest.executeSoon(doTheTest);
+  } else {
+    currentBoxSizing = 0;
+    if (++currentResize < resizeTypes.length) {
+      textarea.style.resize = resizeTypes[currentResize];
+      SimpleTest.executeSoon(doTheTest);
+    } else {
+      currentResize = -1;
+      textarea.style.resize = "";
+      if (++currentPointer < pointerTypes.length) {
+        SimpleTest.executeSoon(doTheTest);
+      } else {
+        SimpleTest.finish();
+      }
+    }
+  }
+}
+
+</script>
+</pre>
+</body>
+</html>