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diff --git a/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html b/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html
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+++ b/dom/events/test/test_use_split_keypress_event_model_on_old_Confluence.html
@@ -0,0 +1,82 @@
+<!DOCTYPE html>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=1514940
+-->
+<head>
+  <meta charset="utf-8">
+  <title>Testing whether "keypress" event model is forcibly split model if the document is old Confluence instance</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=1514940">Bug 1514940</a>
+<p id="display"></p>
+<pre id="test"></pre>
+<input id="input">
+<iframe id="iframe" srcdoc="<html><body><p>Here is editor</p></body></html>"></iframe>
+<script>
+// Emulate window.tinyMCE.CursorTargetPlugin().getInfo() which is referred by
+// KeyPresEventModelCheckerChild.
+class CursorTargetPluginImpl {
+  getInfo() {
+    return {
+      longname: "Cursor Target plugin",
+      author: "Atlassian",
+      authorurl: "http://www.atlassian.com",
+      version: "1.0",
+    };
+  }
+}
+var tinyMCE = {
+  plugins: {
+    CursorTargetPlugin: CursorTargetPluginImpl,
+  },
+};
+
+SimpleTest.waitForExplicitFinish();
+SimpleTest.waitForFocus(async function doTests() {
+  let iframe = document.getElementById("iframe");
+  let waitForCheckKeyPressEventModelEvent = new Promise(resolve => {
+    SpecialPowers.addSystemEventListener(iframe.contentDocument, "CheckKeyPressEventModel", resolve, {once: true});
+  });
+  iframe.contentDocument.body.setAttribute("contenteditable", "true");
+  await waitForCheckKeyPressEventModelEvent;
+  iframe.contentDocument.body.focus();
+  let keypressEvent;
+  iframe.contentDocument.body.addEventListener("keypress", aEvent => keypressEvent = aEvent, {once: true});
+  synthesizeKey("a", {}, iframe.contentWindow);
+  is(keypressEvent.keyCode, 0,
+     "keyCode value of 'a' should be 0");
+  is(keypressEvent.charCode, "a".charCodeAt(0),
+     "charCode value of 'a' should be 'a'");
+
+  iframe.contentDocument.body.addEventListener("keypress", aEvent => keypressEvent = aEvent, {once: true});
+  synthesizeKey("KEY_Enter", {}, iframe.contentWindow);
+  is(keypressEvent.keyCode, KeyboardEvent.DOM_VK_RETURN,
+     "keyCode value of 'Enter' should be DOM_VK_RETURN");
+  is(keypressEvent.charCode, 0,
+     "charCode value of 'Enter' should be 0");
+
+  let input = document.getElementById("input");
+  input.focus();
+  input.addEventListener("keypress", aEvent => keypressEvent = aEvent, {once: true});
+  synthesizeKey("a", {});
+  is(keypressEvent.keyCode, "a".charCodeAt(0),
+     "keyCode value of 'a' in the parent document should be 'a'");
+  is(keypressEvent.charCode, "a".charCodeAt(0),
+     "charCode value of 'a' in the parent document should be 'a'");
+
+  input.addEventListener("keypress", aEvent => keypressEvent = aEvent, {once: true});
+  synthesizeKey("KEY_Enter");
+  is(keypressEvent.keyCode, KeyboardEvent.DOM_VK_RETURN,
+     "keyCode value of 'Enter' in the parent document should be DOM_VK_RETURN");
+  is(keypressEvent.charCode, KeyboardEvent.DOM_VK_RETURN,
+     "charCode value of 'Enter' in the parent document should be DOM_VK_RETURN");
+
+  SimpleTest.finish();
+});
+</script>
+</body>
+</html>