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+<!DOCTYPE>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1250010
+-->
+<head>
+  <title>Test for Bug 1250010</title>
+  <script src="/tests/SimpleTest/SimpleTest.js"></script>
+  <link rel="stylesheet" href="/tests/SimpleTest/test.css">
+  <script src="/tests/SimpleTest/EventUtils.js"></script>
+</head>
+<body>
+<div id="display">
+</div>
+
+<div id="test1" contenteditable><p><b><font color="red">1234567890</font></b></p></div>
+<div id="test2" contenteditable><p><tt>xyz</tt></p><p><tt><img src="data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAYAAAAGCAIAAABvrngfAAAAFklEQVQImWMwjWhCQwxECoW3oCHihAB0LyYv5/oAHwAAAABJRU5ErkJggg=="></tt></p></div>
+
+<pre id="test">
+</pre>
+
+<script class="testbody" type="application/javascript">
+
+function getImageDataURI() {
+  return document.getElementsByTagName("img")[0].getAttribute("src");
+}
+
+/** Test for Bug 1250010 **/
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(function() {
+  // First test: Empty paragraph is split correctly.
+  var div = document.getElementById("test1");
+  div.focus();
+  synthesizeMouseAtCenter(div, {});
+
+  var sel = window.getSelection();
+  var selRange = sel.getRangeAt(0);
+  is(selRange.endContainer.nodeName, "#text", "selection should be at the end of text node");
+  is(selRange.endOffset, 10, "offset should be 10");
+
+  synthesizeKey("KEY_Enter");
+  synthesizeKey("KEY_Enter");
+  sendString("b");
+  synthesizeKey("KEY_ArrowUp");
+  sendString("a");
+
+  is(div.innerHTML, "<p><b><font color=\"red\">1234567890</font></b></p>" +
+                    "<p><b><font color=\"red\">a<br></font></b></p>" +
+                    "<p><b><font color=\"red\">b<br></font></b></p>",
+                    "unexpected HTML");
+
+  // Second test: Since we modified the code path that splits non-text nodes,
+  // test that this works, if the split node is not empty.
+  div = document.getElementById("test2");
+  div.focus();
+  synthesizeMouseAtCenter(div, {});
+
+  selRange = sel.getRangeAt(0);
+  is(selRange.endContainer.nodeName, "#text", "selection should be at the end of text node");
+  is(selRange.endOffset, 3, "offset should be 3");
+
+  // Move behind the image and press enter, insert an "A".
+  // That should insert a new empty paragraph with the "A" after what we have.
+  synthesizeKey("KEY_ArrowRight");
+  synthesizeKey("KEY_ArrowRight");
+  synthesizeKey("KEY_Enter");
+  sendString("A");
+
+  // TODO: The <br> in the new paragraph and the paragraph containing the <img>
+  //       should be removed at typing "A" because they are not necessary
+  //       anymore to make the paragraphs visible (bug 503838).
+  const expectedHTML =
+    "<p><tt>xyz</tt></p><p><tt><img src=\"" + getImageDataURI() + "\"><br></tt></p>" +
+    "<p><tt>A<br></tt></p>";
+  is(
+    div.innerHTML,
+    expectedHTML,
+    "Pressing Enter after the <img> should create new paragraph and which contain <tt> and new text should be inserted in it"
+  );
+
+  SimpleTest.finish();
+});
+
+</script>
+</body>
+
+</html>