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+<!DOCTYPE HTML>
+<html>
+<!--
+https://bugzilla.mozilla.org/show_bug.cgi?id=386782
+-->
+<head>
+  <title>Test for Bug 386782</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" />
+
+  <script>
+
+    // This tests if we can load a document whose root is in designMode,
+    // edit it, navigate to a new page, navigate back, still edit, and still
+    // undo/redo. Note that this is different from the case where the
+    // designMode document is in a frame inside the window, as this means
+    // the editable region is not in the root docshell (a less complicated case).
+
+    var gTests = [
+      {
+        // <html><body><p>designModeDocument</p></body></html>
+        url: "file_bug386782_designmode.html",
+        name: "designModeNavigate",
+        onload(doc) { doc.designMode = "on"; },
+        expectedBodyBeforeEdit: "<p>designModeDocument</p>",
+        expectedBodyAfterEdit:  "<p>EDITED designModeDocument</p>",
+        expectedBodyAfterSecondEdit: "<p>EDITED TWICE designModeDocument</p>",
+      },
+      {
+        // <html><body contentEditable="true"><p>contentEditable</p></body></html>
+        url: "file_bug386782_contenteditable.html",
+        name: "contentEditableNavigate",
+        expectedBodyBeforeEdit: "<p>contentEditable</p>",
+        expectedBodyAfterEdit:  "EDITED <br><p>contentEditable</p>",
+        expectedBodyAfterSecondEdit: "EDITED TWICE <br><p>contentEditable</p>",
+      },
+    ];
+
+    var gTest = null;
+
+    add_task(async () => {
+      while (gTests.length) {
+        gTest = gTests.shift();
+        await runTest();
+      }
+    });
+
+    async function runTest() {
+      gTest.window = window.open(gTest.url, gTest.name, "width=500,height=500");
+      let e = await new Promise(r => window.onmessage = r);
+      is(e.data.persisted, false, "Initial load cannot be persisted");
+      if ("onload" in gTest) {
+        gTest.onload(gTest.window.document);
+      }
+      await SimpleTest.promiseFocus(gTest.window);
+
+      gTest.window.document.body.focus();
+
+      // WARNING: If the following test fails, give the setTimeout() in the onload()
+      // a bit longer; the doc hasn't had enough time to setup its editor.
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyBeforeEdit, "Is doc setup yet");
+      sendString("EDITED ", gTest.window);
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyAfterEdit, "Editing failed.");
+
+      gTest.window.location = "about:blank";
+      await new Promise(r => gTest.window.onpagehide = r);
+      // The active document is updated synchronously after "pagehide" (and
+      // its associated microtasks), so, after waiting for the next global
+      // task, gTest.window will be proxying the realm associated with the
+      // "about:blank" document.
+      // https://html.spec.whatwg.org/multipage/browsing-the-web.html#update-the-session-history-with-the-new-page
+      await new Promise(r => setTimeout(r));
+      is(gTest.window.location.href, "about:blank", "location.href");
+      await SimpleTest.promiseFocus(gTest.window, true);
+
+      gTest.window.history.back();
+      e = await new Promise(r => window.onmessage = r);
+      // Skip the test if the page is not loaded from the bf-cache when going back.
+      if (e.data.persisted) {
+        checkStillEditable();
+      }
+      gTest.window.close();
+    }
+
+    function checkStillEditable() {
+      // Check that the contents are correct.
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyAfterEdit, "Edited contents still correct?");
+
+      // Check that we can undo/redo and the contents are correct.
+      gTest.window.document.execCommand("undo", false, null);
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyBeforeEdit, "Can we undo?");
+
+      gTest.window.document.execCommand("redo", false, null);
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyAfterEdit, "Can we redo?");
+
+      // Check that we can still edit the page.
+      gTest.window.document.body.focus();
+      sendString("TWICE ", gTest.window);
+      is(gTest.window.document.body.innerHTML, gTest.expectedBodyAfterSecondEdit, "Can we still edit?");
+    }
+
+  </script>
+
+</head>
+<body>
+<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=386782">Mozilla Bug 386782</a>
+<p id="display"></p>
+<div id="content" style="display: none">
+
+</div>
+<pre id="test">
+<script class="testbody" type="text/javascript">
+
+/** Test for Bug 386782 **/
+
+SimpleTest.waitForExplicitFinish();
+
+</script>
+</pre>
+</body>
+</html>