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diff --git a/themes/docsy/assets/js/base.js b/themes/docsy/assets/js/base.js
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+/*
+ * Copyright 2018 Google LLC
+
+Licensed under the Apache License, Version 2.0 (the "License");
+you may not use this file except in compliance with the License.
+You may obtain a copy of the License at
+
+    https://www.apache.org/licenses/LICENSE-2.0
+
+Unless required by applicable law or agreed to in writing, software
+distributed under the License is distributed on an "AS IS" BASIS,
+WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+See the License for the specific language governing permissions and
+limitations under the License.
+*/
+
+(function($) {
+
+    'use strict';
+
+    $(function() {
+        $('[data-toggle="tooltip"]').tooltip();
+        $('[data-toggle="popover"]').popover();
+
+        $('.popover-dismiss').popover({
+            trigger: 'focus'
+        })
+    });
+
+
+    function bottomPos(element) {
+        return element.offset().top + element.outerHeight();
+    }
+
+    // Bootstrap Fixed Header
+    $(function() {
+        var promo = $(".js-td-cover");
+        if (!promo.length) {
+            return
+        }
+
+        var promoOffset = bottomPos(promo);
+        var navbarOffset = $('.js-navbar-scroll').offset().top;
+
+        var threshold = Math.ceil($('.js-navbar-scroll').outerHeight());
+        if ((promoOffset - navbarOffset) < threshold) {
+            $('.js-navbar-scroll').addClass('navbar-bg-onscroll');
+        }
+
+
+        $(window).on('scroll', function() {
+            var navtop = $('.js-navbar-scroll').offset().top - $(window).scrollTop();
+            var promoOffset = bottomPos($('.js-td-cover'));
+            var navbarOffset = $('.js-navbar-scroll').offset().top;
+            if ((promoOffset - navbarOffset) < threshold) {
+                $('.js-navbar-scroll').addClass('navbar-bg-onscroll');
+            } else {
+                $('.js-navbar-scroll').removeClass('navbar-bg-onscroll');
+                $('.js-navbar-scroll').addClass('navbar-bg-onscroll--fade');
+            }
+        });
+    });
+
+
+}(jQuery));