eg.visible not working with first Element param

[happyhj]

Description

eg.visible is not working property when the first parameter is Element.
When the first parameter is document, it works well

Steps to check or reproduce

var visibleView = new eg.Visible($("#content"), { ...

Element as wrapper demo <--- not working
document as wrapper demo <--- working

[happyhj]

The first parameter of eg.Visible() is container of scrollerable child elements that overflow parent element.

So demo on the first link is working properly. Because container $("#content") does not have fixed height so children of the container cannot overflow.

Visibility at eg.Visible is not related with browser's viewport except when the first parameter is document.