Kerning (Character or Letter Spacing) is controllable in HTML 5 with a px value, it can only be applied to the entire block of text and not individual letters within a block of text as far as i know. I am not sure how each browser supports those changes. Just be aware that it only applies to the entire character block.
if you go to this link you can see how it works and the result. http://codepen.io/zakkain/pen/kIEli