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diff --git a/devtools/client/inspector/markup/test/browser_markup_keybindings_03.js b/devtools/client/inspector/markup/test/browser_markup_keybindings_03.js
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+++ b/devtools/client/inspector/markup/test/browser_markup_keybindings_03.js
@@ -0,0 +1,64 @@
+/* Any copyright is dedicated to the Public Domain.
+ http://creativecommons.org/publicdomain/zero/1.0/ */
+
+"use strict";
+
+// Tests that selecting a node with the mouse (by clicking on the line) focuses
+// the first focusable element in the corresponding MarkupContainer so that the
+// keyboard can be used immediately.
+
+const TEST_URL = `data:text/html;charset=utf8,
+                  <div class='test-class'></div>Text node`;
+
+add_task(async function () {
+  const { inspector } = await openInspectorForURL(TEST_URL);
+  const { walker } = inspector;
+
+  info("Select the test node to have the 2 test containers visible");
+  await selectNode("div", inspector);
+
+  const divFront = await walker.querySelector(walker.rootNode, "div");
+  const textFront = await walker.nextSibling(divFront);
+
+  info("Click on the MarkupContainer element for the text node");
+  await clickContainer(textFront, inspector);
+  is(
+    inspector.markup.doc.activeElement,
+    getContainerForNodeFront(textFront, inspector).editor.textNode.valuePreRef
+      .current,
+    "The currently focused element is the node's text content"
+  );
+
+  info("Click on the MarkupContainer element for the <div> node");
+  await clickContainer(divFront, inspector);
+  is(
+    inspector.markup.doc.activeElement,
+    getContainerForNodeFront(divFront, inspector).editor.tag,
+    "The currently focused element is the div's tagname"
+  );
+
+  info("Click on the test-class attribute, to make sure it gets focused");
+  const editor = getContainerForNodeFront(divFront, inspector).editor;
+  const attributeEditor = editor.attrElements
+    .get("class")
+    .querySelector(".editable");
+
+  const onFocus = once(attributeEditor, "focus");
+  EventUtils.synthesizeMouseAtCenter(
+    attributeEditor,
+    { type: "mousedown" },
+    inspector.markup.doc.defaultView
+  );
+  EventUtils.synthesizeMouseAtCenter(
+    attributeEditor,
+    { type: "mouseup" },
+    inspector.markup.doc.defaultView
+  );
+  await onFocus;
+
+  is(
+    inspector.markup.doc.activeElement,
+    attributeEditor,
+    "The currently focused element is the div's class attribute"
+  );
+});