Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/contextual/js/views/AuralView.js

@@ -0,0 +1,54 @@
+/**
+ * @file
+ * A Backbone View that provides the aural view of a contextual link.
+ */
+
+(function (Drupal, Backbone) {
+
+  "use strict";
+
+  Drupal.contextual.AuralView = Backbone.View.extend(/** @lends Drupal.contextual.AuralView# */{
+
+    /**
+     * Renders the aural view of a contextual link (i.e. screen reader support).
+     *
+     * @constructs
+     *
+     * @augments Backbone.View
+     *
+     * @param {object} options
+     */
+    initialize: function (options) {
+      this.options = options;
+
+      this.listenTo(this.model, 'change', this.render);
+
+      // Use aria-role form so that the number of items in the list is spoken.
+      this.$el.attr('role', 'form');
+
+      // Initial render.
+      this.render();
+    },
+
+    /**
+     * @inheritdoc
+     */
+    render: function () {
+      var isOpen = this.model.get('isOpen');
+
+      // Set the hidden property of the links.
+      this.$el.find('.contextual-links')
+        .prop('hidden', !isOpen);
+
+      // Update the view of the trigger.
+      this.$el.find('.trigger')
+        .text(Drupal.t('@action @title configuration options', {
+          '@action': (!isOpen) ? this.options.strings.open : this.options.strings.close,
+          '@title': this.model.get('title')
+        }))
+        .attr('aria-pressed', isOpen);
+    }
+
+  });
+
+})(Drupal, Backbone);