I want to capitalize the first letter of sentences, and also the first letter after commas if possible. I want to add the code in here:
text-transform:capitalize; will capitalize the first letter of a sentence, but if you want to also do it for commas you will have to write some javascript. I agree with @BoltClock, though. Why on earth would you want to capitalize after a comma?
Edit: For the sake of readers: text-transform:capitalize; will capitalize each word of a sentence, not the first one only.
You must use the :first-letter CSS selector with the above.