Takes top border width in account (cont #2874)

web/viewer.js

@@ -63,7 +63,8 @@ function scrollIntoView(element, spot) {
   // Assuming offsetParent is available (it's not available when viewer is in
   // hidden iframe or object). We have to scroll: if the offsetParent is not set
   // producing the error. See also animationStartedClosure.
-  var parent = element.offsetParent, offsetY = element.offsetTop;
+  var parent = element.offsetParent;
+  var offsetY = element.offsetTop + element.clientTop;
   if (!parent) {
     console.error('offsetParent is not set -- cannot scroll');
     return;