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diff --git a/devtools/client/inspector/markup/views/root-container.js b/devtools/client/inspector/markup/views/root-container.js
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+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+"use strict";
+
+/**
+ * Dummy container node used for the root document element.
+ */
+function RootContainer(markupView, node) {
+ this.doc = markupView.doc;
+ this.elt = this.doc.createElement("ul");
+ // Root container has tree semantics for accessibility.
+ this.elt.setAttribute("role", "tree");
+ this.elt.setAttribute("tabindex", "0");
+ this.elt.setAttribute("aria-dropeffect", "none");
+ this.elt.container = this;
+ this.children = this.elt;
+ this.node = node;
+ this.toString = () => "[root container]";
+}
+
+RootContainer.prototype = {
+ hasChildren: true,
+ expanded: true,
+ update: function () {},
+ destroy: function () {},
+
+ /**
+ * If the node has children, return the list of containers for all these children.
+ * @return {Array} An array of child containers or null.
+ */
+ getChildContainers: function () {
+ return [...this.children.children].filter(node => node.container)
+ .map(node => node.container);
+ },
+
+ /**
+ * Set the expanded state of the container node.
+ * @param {Boolean} value
+ */
+ setExpanded: function () {},
+
+ /**
+ * Set an appropriate role of the container's children node.
+ */
+ setChildrenRole: function () {},
+
+ /**
+ * Set an appropriate DOM tree depth level for a node and its subtree.
+ */
+ updateLevel: function () {}
+};
+
+module.exports = RootContainer;