Answer 1

don't use it at all. there's no need to and no benefit in constant animation of text. no one wants or likes to read text which doesn't stand still.
but if you really, really, really have to animate text, use JavaScript. I think it's much easier/better than using css transitions.

Answer 2

jQuery has a function slideIn, if I'm not mistaken.

Answer 3

Check this code:
https://code.sololearn.com/WvrAw2VeMoHu/#html
I've started to write some stuff to do marquee substitute... It's already working as pure CSS, but still work in progress ( in fact stopped: I doesn't know if and when I will continue :P ) on JS handler part ( but it's far advanced anyway )...

Answer 4

maybe this will help: http://jsfiddle.net/HAQyK/1/