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+<!DOCTYPE html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1310912
+-->
+<html>
+<head>
+  <title>Test for Bug 1310912</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>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1310912">Mozilla Bug 1310912</a>
+<p id="display"></p>
+<div id="content" style="display: none;">
+
+</div>
+
+<div contenteditable>ABC</div>
+<pre id="test">
+
+<script class="testbody" type="application/javascript">
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  let editor = document.querySelector("div[contenteditable]");
+
+  editor.focus();
+  let sel = window.getSelection();
+  sel.collapse(editor.childNodes[0], editor.textContent.length);
+
+  synthesizeCompositionChange({
+    composition: {
+      string: "DEF",
+      clauses: [
+        { length: 3, attr: COMPOSITION_ATTR_RAW_CLAUSE },
+      ],
+    },
+    caret: { start: 3, length: 0 },
+  });
+  is(editor.textContent, "ABCDEF", "composing text should be set");
+
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
+  synthesizeCompositionChange({
+    composition: {
+      string: "GHI",
+      clauses: [
+        { length: 3, attr: COMPOSITION_ATTR_CONVERTED_CLAUSE },
+      ],
+    },
+    caret: { start: 0, length: 0 },
+  });
+  is(editor.textContent, "ABCGHI", "composing text should be replaced");
+
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
+  synthesizeCompositionChange({
+    composition: {
+      string: "JKL",
+      clauses: [
+        { length: 3, attr: COMPOSITION_ATTR_CONVERTED_CLAUSE },
+      ],
+    },
+    caret: { start: 0, length: 0 },
+  });
+  is(editor.textContent, "ABCJKL", "composing text should be replaced");
+
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
+  synthesizeCompositionChange({
+    composition: {
+      string: "MNO",
+      clauses: [
+        { length: 3, attr: COMPOSITION_ATTR_CONVERTED_CLAUSE },
+      ],
+    },
+    caret: { start: 1, length: 0 },
+  });
+  is(editor.textContent, "ABCMNO", "composing text should be replaced");
+
+  // Normal selection is the caret, therefore, inserting empty text node
+  // creates the following DOM tree:
+  // <div contenteditable>
+  //  |- #text ("ABCM")
+  //  |- #text ("")
+  //  +- #text ("NO")
+  window.getSelection().getRangeAt(0).insertNode(document.createTextNode(""));
+  is(editor.childNodes[0].data, "ABCM",
+     "First text node should only have \"M\" of the composition string");
+  is(editor.childNodes[1].data, "",
+     "Second text node should be the inserted empty text node");
+  is(editor.childNodes[2].data, "NO",
+     "Third text node should have the remaining composition string");
+  todo_is(editor.childNodes[3].nodeName, "BR",
+     "Forth node is empty text node, but I don't where this comes from");
+
+  // Then, committing composition makes the commit string into the first
+  // text node and makes the following text nodes empty.
+  // XXX I don't know whether the empty text nodes should be removed or not
+  //     at this moment.
+  synthesizeComposition({ type: "compositioncommitasis" });
+  is(editor.textContent, "ABCMNO",
+     "composing text should be committed");
+  is(editor.childNodes[0].data, "ABCMNO",
+     "First text node should have the committed string");
+
+  synthesizeKey("Z", { accelKey: true });
+  is(editor.textContent, "ABC",
+     "text should be undone (commit string should've gone");
+  is(editor.childNodes[0].data, "ABC",
+     "First text node should have the committed string after undone");
+
+  synthesizeKey("Z", { accelKey: true, shiftKey: true });
+  is(editor.textContent, "ABCMNO",
+     "text should be redone (commit string should've be back");
+  is(editor.childNodes[0].data, "ABCMNO",
+     "First text node should have the committed string after redone");
+
+  SimpleTest.finish();
+});
+</script>
+</pre>
+</body>
+</html>