The Gold Standard for Math Typesetting on the Internet

Through a wonderful little game called TeXnique, I became aware of the online typesetting system KaTeX. Unlike MathJax, which is immensely finicky, slow, and has limited support for proper LaTeX, the KaTeX system supports scaling of rendered images, automatically detects the text color of my site and adapts as necessary, and has a fuller implementation of LaTeX commands.