javascript - How to make CSS "execute" when user is viewing that part of the page? -


similar how css can executed events using :hover, how make same code execute when user viewing part of page? example: user scrolls down footer, , nice css effects execute. i'll add javascript tag thread incase needed.

edit comment: more context...i have button bunch of css effects in place, , looking "activate" them upon viewing.

css not made that. have use javascript.


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