In principle, there's no reason why web browsers couldn't incorporate the same typesetting algorithms that LaTeX uses. In fact it's quite practical to write a H

In principle, there's no reason why web browsers couldn't incorporate the same typesetting algorithms that LaTeX uses. In fact it's quite practical to write a HTML to LaTeX converter and get quite good results out of it (I'm doing this right now). The only caveat is that you don't get the same level of control that you have with LaTeX, in cases where the default behaviour is different to what you want.