I\'m trying to do what the title says. I\'ve seen that font-size
can be a percentage. So my guess was that font-size: 100%;
would do it, but no.
This question might help you out but I warn you though this solves it through jQuery:
Auto-size dynamic text to fill fixed size container
Good luck.
The OP of that question made a plugin, here is the link to it (& download)
BTW I'm suggesting jQuery because as Gaby pointed out this can't be done though CSS only and you said you were willing to use js...