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Stuck? Don't know how to implement what you have in mind? Here are some sources you may find useful:
The TeX Stack ExchangeThis is a webpage designed for real-time formula (be ware: this is NOT for entire LaTeX documents) edition. It uses MathJax to render the formula, whose syntax is very much akin to that of LaTeX, except having much fewer symbols and environments. See the links above for more detailed information about both.