|---header of html ----|
|----------------------|
|----------------------|
|----------------------|
|----------------------| not displayed in browser
|----------------------|
||----------------------|| <-----------
||----------------------||
||----------------------||
||----------------------|| browser, the part that human
||----------------------|| actually see
||----------------------||
||----------------------|| <------------
|----------------------|
|----------------------| not displayed in browser
|----------------------|
|----------------------|
|----------------------|
|----------------------|
|----------------------|
|----------------------|
|-----end of html------|
How to know if an element is actually appeared in browser and can seen by human's eye?
jquery's visible
seems cannot do this.