This is the *first* editor. Just plain **Markdown**, except that the input is sanitized: <marquee>I'm the ghost from the past!</marquee> MathJax rendering is also enabled. Inline looks like $f: \mathbb R \to \mathbb C$ and displaymath looks like $$ \int_0^\infty e^{-x^2}\,dx = \frac{\sqrt{\pi}}{2}. $$ Some code `here`

This is the *second* editor. Also just plain **Markdown**, but the input is **NOT** sanitized: <marquee>I'm the ghost from the past!</marquee> MathJax rendering is enabled here too. Inline looks like $g: \mathbb Z \to \mathbb Q$ and displaymath looks like $$ \frac{1}{\Gamma(z)} = z e^{\gamma z} \prod_{n=1}^{\infty} \left(1 + \frac{z}{n}\right) e^{-z/n}. $$ That's it!