Merge pull request #28 from Caged/scroll-offsets-fix

Use documentElement as the default for scroll offsets

Author: Justin Palmer

index.js

@@ -246,13 +246,9 @@ d3.tip = function() {
         height     = tbbox.height,
         x          = tbbox.x,
         y          = tbbox.y,
-        scrollTop  = document.body.scrollTop,
-        scrollLeft = document.body.scrollLeft
+        scrollTop  = document.documentElement.scrollTop || document.body.scrollTop,
+        scrollLeft = document.documentElement.scrollLeft || document.body.scrollLeft
 
-    if(document.documentElement && document.documentElement.scrollTop) {
-      scrollTop  = document.documentElement.scrollTop
-      scrollLeft = document.documentElement.scrollLeft
-    }
 
     point.x = x + scrollLeft
     point.y = y + scrollTop