grunt

js/dist/modal.js

@@ -436,7 +436,7 @@ var Modal = function ($) {
       var scrollDiv = document.createElement('div');
       scrollDiv.className = ClassName.SCROLLBAR_MEASURER;
       document.body.appendChild(scrollDiv);
-      var scrollbarWidth = scrollDiv.offsetWidth - scrollDiv.clientWidth;
+      var scrollbarWidth = scrollDiv.getBoundingClientRect().width - scrollDiv.clientWidth;
       document.body.removeChild(scrollDiv);
       return scrollbarWidth;
     };

js/dist/scrollspy.js

@@ -126,9 +126,12 @@ var ScrollSpy = function ($) {
           target = $(targetSelector)[0];
         }
 
-        if (target && (target.offsetWidth || target.offsetHeight)) {
-          // todo (fat): remove sketch reliance on jQuery position/offset
-          return [$(target)[offsetMethod]().top + offsetBase, targetSelector];
+        if (target) {
+          var targetBCR = target.getBoundingClientRect();
+          if (targetBCR.width || targetBCR.height) {
+            // todo (fat): remove sketch reliance on jQuery position/offset
+            return [$(target)[offsetMethod]().top + offsetBase, targetSelector];
+          }
         }
         return null;
       }).filter(function (item) {
@@ -183,7 +186,7 @@ var ScrollSpy = function ($) {
     };
 
     ScrollSpy.prototype._getOffsetHeight = function _getOffsetHeight() {
-      return this._scrollElement === window ? window.innerHeight : this._scrollElement.offsetHeight;
+      return this._scrollElement === window ? window.innerHeight : this._scrollElement.getBoundingClientRect().height;
     };
 
     ScrollSpy.prototype._process = function _process() {