TeX extensions: Improve `\style` to inherit better (was: Mathjax not rendering styles)

Created by: jnoreiga

When I have the following latex mathjax isn't rendering styles. It's a problem with generating styles in general

\style{font-size:72px;font-family:Verdana}{\sqrt{12{\color[rgb]{1.0, 1.0, 0.0}3}{\mathit4}_{1^{\mathbf23}}}}