Merge pull request #297 from QingWei-Li/fix/popper.js

Fix popper.js bug in IE, #291

src/utils/popper.js

@@ -1058,7 +1058,10 @@
             ['scroll', 'auto'].indexOf(getStyleComputedProperty(element, 'overflow-x')) !== -1 ||
             ['scroll', 'auto'].indexOf(getStyleComputedProperty(element, 'overflow-y')) !== -1
         ) {
-            return element;
+            // If the detected scrollParent is body, we perform an additional check on its parentNode
+            // in this way we'll get body if the browser is Chrome-ish, or documentElement otherwise
+            // fixes issue #65
+            return element === root.document.body ? getScrollParent(element.parentNode) : element;
         }
         return element.parentNode ? getScrollParent(element.parentNode) : element;
     }