Move all files to 2017/

2017/web/core/misc/details-aria.es6.js

@@ -0,0 +1,30 @@
+/**
+ * @file
+ * Add aria attribute handling for details and summary elements.
+ */
+
+(function($, Drupal) {
+  /**
+   * Handles `aria-expanded` and `aria-pressed` attributes on details elements.
+   *
+   * @type {Drupal~behavior}
+   */
+  Drupal.behaviors.detailsAria = {
+    attach() {
+      $('body')
+        .once('detailsAria')
+        .on('click.detailsAria', 'summary', event => {
+          const $summary = $(event.currentTarget);
+          const open =
+            $(event.currentTarget.parentNode).attr('open') === 'open'
+              ? 'false'
+              : 'true';
+
+          $summary.attr({
+            'aria-expanded': open,
+            'aria-pressed': open,
+          });
+        });
+    },
+  };
+})(jQuery, Drupal);