diff -r 000000000000 -r 6474c204b198 browser/devtools/markupview/test/browser_markupview_navigation.js
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/browser/devtools/markupview/test/browser_markupview_navigation.js	Wed Dec 31 06:09:35 2014 +0100
@@ -0,0 +1,128 @@
+/* vim: set ts=2 et sw=2 tw=80: */
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Test that the markup-view nodes can be navigated to with the keyboard
+
+const TEST_URL = TEST_URL_ROOT + "doc_markup_navigation.html";
+const TEST_DATA = [
+  ["pageup", "*doctype*"],
+  ["down", "html"],
+  ["down", "head"],
+  ["down", "body"],
+  ["down", "node0"],
+  ["right", "node0"],
+  ["down", "node1"],
+  ["down", "node2"],
+  ["down", "node3"],
+  ["down", "*comment*"],
+  ["down", "node4"],
+  ["right", "node4"],
+  ["down", "*text*"],
+  ["down", "node5"],
+  ["down", "node6"],
+  ["down", "*comment*"],
+  ["down" , "node7"],
+  ["right", "node7"],
+  ["down", "*text*"],
+  ["down", "node8"],
+  ["left", "node7"],
+  ["left", "node7"],
+  ["right", "node7"],
+  ["right", "*text*"],
+  ["down", "node8"],
+  ["right", "node8"],
+  ["left", "node8"],
+  ["down", "node9"],
+  ["down", "node10"],
+  ["down", "node11"],
+  ["down", "node12"],
+  ["right", "node12"],
+  ["down", "*text*"],
+  ["down", "node13"],
+  ["down", "node14"],
+  ["down", "node15"],
+  ["down", "node15"],
+  ["down", "node15"],
+  ["up", "node14"],
+  ["up", "node13"],
+  ["up", "*text*"],
+  ["up", "node12"],
+  ["left", "node12"],
+  ["down", "node14"],
+  ["home", "*doctype*"],
+  ["pagedown", "*text*"],
+  ["down", "node5"],
+  ["down", "node6"],
+  ["down", "*comment*"],
+  ["down", "node7"],
+  ["left", "node7"],
+  ["down", "node9"],
+  ["down", "node10"],
+  ["pageup", "node2"],
+  ["pageup", "*doctype*"],
+  ["down", "html"],
+  ["left", "html"],
+  ["down", "html"]
+];
+
+let test = asyncTest(function*() {
+  let {inspector} = yield addTab(TEST_URL).then(openInspector);
+
+  info("Making sure the markup-view frame is focused");
+  inspector.markup._frame.focus();
+
+  info("Starting to iterate through the test data");
+  for (let [key, className] of TEST_DATA) {
+    info("Testing step: " + key + " to navigate to " + className);
+    pressKey(key);
+
+    info("Making sure markup-view children get updated");
+    yield waitForChildrenUpdated(inspector);
+
+    info("Checking the right node is selected");
+    checkSelectedNode(key, className, inspector);
+  }
+});
+
+function pressKey(key) {
+  switch(key) {
+    case "right":
+      EventUtils.synthesizeKey("VK_RIGHT", {});
+      break;
+    case "down":
+      EventUtils.synthesizeKey("VK_DOWN", {});
+      break;
+    case "left":
+      EventUtils.synthesizeKey("VK_LEFT", {});
+      break;
+    case "up":
+      EventUtils.synthesizeKey("VK_UP", {});
+      break;
+    case "pageup":
+      EventUtils.synthesizeKey("VK_PAGE_UP", {});
+      break;
+    case "pagedown":
+      EventUtils.synthesizeKey("VK_PAGE_DOWN", {});
+      break;
+    case "home":
+      EventUtils.synthesizeKey("VK_HOME", {});
+      break;
+  }
+}
+
+function checkSelectedNode(key, className, inspector) {
+  let node = inspector.selection.node;
+
+  if (className == "*comment*") {
+    is(node.nodeType, Node.COMMENT_NODE, "Found a comment after pressing " + key);
+  } else if (className == "*text*") {
+    is(node.nodeType, Node.TEXT_NODE, "Found text after pressing " + key);
+  } else if (className == "*doctype*") {
+    is(node.nodeType, Node.DOCUMENT_TYPE_NODE, "Found the doctype after pressing " + key);
+  } else {
+    is(node.className, className, "Found node: " + className + " after pressing " + key);
+  }
+}