A quick javascript question on hidden HTML elements

JavaScript
1

I have a javascript function on my HTML page that periodically assigns content to a DIV. This I am doing with a timer (setTimeout).

If under certain circumstances, display of the DIV is set to ‘none’ or the visibility is set to ‘hidden’, how does Javascript handle it?

2

I should probably figure out a way (test for the display status of the DIV) to not invoke the JS when the DIV is hidden. Thank you for your help.

3

Set the div can solve your problem, no need to use js

4

The element is still in the HTML and so JavaScript can update it. That the CSS hides it from being displayed makes no difference.