grunt

dist/css/bootstrap-grid.css

@@ -1,3 +1,20 @@
+@-ms-viewport {
+  width: device-width;
+}
+
+html {
+  -webkit-box-sizing: border-box;
+          box-sizing: border-box;
+  -ms-overflow-style: scrollbar;
+}
+
+*,
+*::before,
+*::after {
+  -webkit-box-sizing: inherit;
+          box-sizing: inherit;
+}
+
 .container {
   margin-left: auto;
   margin-right: auto;

dist/js/bootstrap.js

@@ -1549,11 +1549,7 @@ var Dropdown = function ($) {
         return;
       }
 
-      var items = $.makeArray($(Selector.VISIBLE_ITEMS));
-
-      items = items.filter(function (item) {
-        return item.offsetWidth || item.offsetHeight;
-      });
+      var items = $(parent).find(Selector.VISIBLE_ITEMS).get();
 
       if (!items.length) {
         return;