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+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=795785
+-->
+<head>
+  <title>Test for Bug 795785</title>
+  <script type="text/javascript" src="/MochiKit/MochiKit.js"></script>
+  <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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=795785">Mozilla Bug 795785</a>
+<div id="display">
+  <textarea id="textarea" style="overflow: hidden; height: 3em; width: 5em; word-wrap: normal;"></textarea>
+  <div id="div" contenteditable style="overflow: hidden; height: 3em; width: 5em;"></div>
+</div>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.requestFlakyTimeout("This test uses setTimeouts in order to fix an intermittent failure.");
+
+// Turn off spatial navigation because it hijacks arrow key events and VK_RETURN
+// events.
+SimpleTest.waitForFocus(function() {
+  SpecialPowers.pushPrefEnv({"set": [["snav.enabled", false]]}, runTests);
+});
+var textarea = document.getElementById("textarea");
+var div = document.getElementById("div");
+
+function hitEventLoop(aFunc, aTimes) {
+  if (--aTimes) {
+    setTimeout(hitEventLoop, 0, aFunc, aTimes);
+  } else {
+    setTimeout(aFunc, 100);
+  }
+}
+
+function doKeyEventTest(aElement, aElementDescription, aCallback) {
+  aElement.focus();
+  aElement.scrollTop = 0;
+  hitEventLoop(function() {
+    is(aElement.scrollTop, 0,
+       aElementDescription + "'s scrollTop isn't 0");
+    synthesizeKey("KEY_Enter", {shiftKey: true, repeat: 6});
+    hitEventLoop(function() {
+      isnot(aElement.scrollTop, 0,
+            aElementDescription + " was not scrolled by inserting line breaks");
+      var scrollTop = aElement.scrollTop;
+      synthesizeKey("KEY_ArrowUp", {repeat: 5});
+      hitEventLoop(function() {
+        isnot(aElement.scrollTop, scrollTop,
+              aElementDescription + " was not scrolled by up key events");
+        synthesizeKey("KEY_ArrowDown", {repeat: 5});
+        hitEventLoop(function() {
+          is(aElement.scrollTop, scrollTop,
+             aElementDescription + " was not scrolled by down key events");
+          var longWord = "aaaaaaaaaaaaaaaaaaaa";
+          sendString(longWord);
+          hitEventLoop(function() {
+            isnot(aElement.scrollLeft, 0,
+                  aElementDescription + " was not scrolled by typing long word");
+            var scrollLeft = aElement.scrollLeft;
+            synthesizeKey("KEY_ArrowLeft", {repeat: longWord.length});
+            hitEventLoop(function() {
+              isnot(aElement.scrollLeft, scrollLeft,
+                    aElementDescription + " was not scrolled by left key events");
+              synthesizeKey("KEY_ArrowRight", {repeat: longWord.length});
+              hitEventLoop(function() {
+                is(aElement.scrollLeft, scrollLeft,
+                   aElementDescription + " was not scrolled by right key events");
+                aCallback();
+              }, 20);
+            }, 20);
+          }, 20);
+        }, 20);
+      }, 20);
+    }, 20);
+  }, 20);
+}
+
+function doCompositionTest(aElement, aElementDescription, aCallback) {
+  aElement.focus();
+  aElement.scrollTop = 0;
+  hitEventLoop(function() {
+    is(aElement.scrollTop, 0,
+       aElementDescription + "'s scrollTop isn't 0");
+    var str = "Web \u958b\u767a\u8005\u306e\u7686\u3055\u3093\u306f\u3001" +
+              "Firefox \u306b\u5b9f\u88c5\u3055\u308c\u3066\u3044\u308b HTML5" +
+              " \u3084 CSS \u306e\u65b0\u6a5f\u80fd\u3092\u6d3b\u7528\u3059" +
+              "\u308b\u3053\u3068\u3067\u3001\u9b45\u529b\u3042\u308b Web " +
+              "\u30b5\u30a4\u30c8\u3084\u9769\u65b0\u7684\u306a Web \u30a2" +
+              "\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u3088\u308a" +
+              "\u77ed\u6642\u9593\u3067\u7c21\u5358\u306b\u4f5c\u6210\u3067" +
+              "\u304d\u307e\u3059\u3002";
+    synthesizeCompositionChange({
+        composition: {
+          string: str,
+          clauses: [
+            { length: str.length, attr: COMPOSITION_ATTR_RAW_CLAUSE },
+          ],
+        },
+        caret: { start: str.length, length: 0 },
+      });
+    hitEventLoop(function() {
+      isnot(aElement.scrollTop, 0,
+            aElementDescription + " was not scrolled by composition");
+      synthesizeComposition({ type: "compositioncommit", data: "" });
+      hitEventLoop(function() {
+        is(aElement.scrollTop, 0,
+           aElementDescription + " was not scrolled back to the top by canceling composition");
+        aCallback();
+      }, 20);
+    }, 20);
+  }, 20);
+}
+
+function runTests() {
+  doKeyEventTest(textarea, "textarea",
+    function() {
+      textarea.value = "";
+      doKeyEventTest(div, "div (contenteditable)",
+        function() {
+          div.innerHTML = "";
+          doCompositionTest(textarea, "textarea",
+            function() {
+              doCompositionTest(div, "div (contenteditable)",
+                function() {
+                  SimpleTest.finish();
+                });
+            });
+        });
+    });
+}
+
+</script>
+</body>
+
+</html>