MDL-80593 core: Make Modal to work with Debug Template Info mode

lib/amd/src/modal.js

@@ -90,6 +90,22 @@ export default class Modal {
      */
     static modalCounter = 0;
 
+    /**
+     * Getter method for .root element.
+     * @return {object} jQuery object
+     */
+    get root() {
+        return $(this._root.filter(SELECTORS.CONTAINER));
+    }
+
+    /**
+     * Setter method for .root element.
+     * @param {object} root jQuery object
+     */
+    set root(root) {
+        this._root = root;
+    }
+
     /**
      * Constructor for the Modal.
      *
@@ -277,7 +293,7 @@ export default class Modal {
      * @method attachToDOM
      */
     attachToDOM() {
-        this.getAttachmentPoint().append(this.root);
+        this.getAttachmentPoint().append(this._root);
 
         if (this.isAttached) {
             return;