toplisek - 7:57 pm on Jan 30, 2013 (gmt 0)

You are right. Usability issue can be seen if this happens. I gues they detect also resolution to pass this particular issue.

I'm nor sure about your URL:
[api.jquery.com...]

It is not quoted my value:
What will influence != 0 or > 100
It is the current vertical position of the scroll bar for each of the set of matched elements.More than 100px position from the top.Yes?
What is than !=0 ?