Next to the use of symbolic HTML expressions to create HTML documents, Ctadel can also parse LATEX files and convert the math in the files into HTML.
This is done by evaluating symbolic expressions in the file, translating the result to LATEX, and display the math in HTML using TTH.
For example:
The derivative of $sin(x^2)$ is $>diff(sin(x^2),x)$.is shown both in LATEX and HTML as
I use this feature all the time to create Web materials for a course.