Update to Drupal 8.1.0. For more information, see https://www.drupal.org/drupal-8.1.0-release-notes

core/misc/tableheader.js

@@ -11,6 +11,9 @@
    * Attaches sticky table headers.
    *
    * @type {Drupal~behavior}
+   *
+   * @prop {Drupal~behaviorAttach} attach
+   *   Attaches the sticky table header behavior.
    */
   Drupal.behaviors.tableHeader = {
     attach: function (context) {
@@ -215,9 +218,12 @@
      * Set absolute position of sticky.
      *
      * @param {number} offsetTop
+     *   The top offset for the sticky header.
      * @param {number} offsetLeft
+     *   The left offset for the sticky header.
      *
      * @return {jQuery}
+     *   The sticky table as a jQuery collection.
      */
     stickyPosition: function (offsetTop, offsetLeft) {
       var css = {};
@@ -234,6 +240,7 @@
      * Returns true if sticky is currently visible.
      *
      * @return {bool}
+     *   The visibility status.
      */
     checkStickyVisible: function () {
       var scrollTop = scrollValue('scrollTop');
@@ -256,6 +263,7 @@
      * calls.
      *
      * @param {jQuery.Event} e
+     *   The scroll event.
      */
     onScroll: function (e) {
       this.checkStickyVisible();