1 files changed, 80 insertions, 0 deletions
diff --git a/docshell/test/chrome/bug449780_window.xhtml b/docshell/test/chrome/bug449780_window.xhtml
new file mode 100644
index 0000000000..3b0096d2e9
--- /dev/null
+++ b/docshell/test/chrome/bug449780_window.xhtml
@@ -0,0 +1,80 @@
+<?xml version="1.0"?>
+<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
+<window title="Mozilla Bug 449780" onload="setTimeout(doTheTest, 0);"
+  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">
+
+  <hbox id="parent">
+  </hbox>
+
+  <!-- test code goes here -->
+  <script type="application/javascript" src="chrome://mochikit/content/chrome-harness.js" />
+  <script type="application/javascript" src="docshell_helpers.js" />
+  <script type="application/javascript"><![CDATA[
+    function addBrowser(parent, width, height) {
+      var b =
+        document.createElementNS("http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul", "browser");
+      b.setAttribute("type", "content");
+      b.setAttribute("id", "content");
+      b.setAttribute("width", width);
+      b.setAttribute("height", height);
+      b.setAttribute("remote", SpecialPowers.Services.appinfo.sessionHistoryInParent);
+      document.getElementById("parent").appendChild(b);
+      return b;
+    }
+
+    let f1 = addBrowser("parent", 300, 200);
+
+    /** Test for Bug 449780 **/
+    var doc1 = "data:text/html,<html><body>This is a test</body></html>";
+    var doc2 = "data:text/html,<html><body>This is a second test</body></html>";
+
+    async function doTheTest() {
+      await promisePageNavigation({
+        uri: doc1,
+      });
+      let { origDOM, modifiedDOM } = await SpecialPowers.spawn(f1, [], () => {
+        var origDOM = content.document.documentElement.innerHTML;
+        content.document.body.textContent = "Modified";
+        var modifiedDOM = content.document.documentElement.innerHTML;
+        isnot(origDOM, modifiedDOM, "DOM should be different");
+        return { origDOM, modifiedDOM };
+      });
+
+      await promisePageNavigation({
+        uri: doc2,
+      });
+
+      await promisePageNavigation({
+        back: true,
+      });
+
+      await SpecialPowers.spawn(f1, [modifiedDOM], (modifiedDOM) => {
+        is(content.document.documentElement.innerHTML, modifiedDOM, "Should have been bfcached");
+      });
+
+      await promisePageNavigation({
+        forward: true,
+      });
+
+      f1.removeAttribute("id");
+      let f2 = addBrowser("parent", 300, 200);
+
+      // Make sure there's a document or the swap will fail.
+      await promisePageNavigation({
+        uri: "about:blank",
+      });
+
+      f1.swapDocShells(f2);
+
+      await promisePageNavigation({
+        back: true,
+      });
+
+      await SpecialPowers.spawn(f2, [origDOM], (origDOM) => {
+        is(content.document.documentElement.innerHTML, origDOM, "Should not have been bfcached");
+      });
+
+      finish();
+    }
+  ]]></script>
+</window>