Ranked in these QuestionsQuestion Ranking
Pro MathJax support
MathJax is a display engine that helps render mathematics properly.
Pro Preview incldues syntax highlighting
The syntax is highlighted in the Preview pane. The programming language in use is guessed. The code block has to be indented 4 spaces (or a tab) for the syntax highlighting to work.
Pro Can export to Google Docs
Con Lacks synchronized scrolling
The editing and preview panes don't scroll together. They have to be manually adjusted to align.