Need Javascript library for math search

Short Version
-------------

Anyone knows of a client side Javascript library for search math equations in a
webpage? I would like to use one at
https://github.com/r-gaia-cs/math-cheat-sheet.

Long Version
------------

I was talking with Frédéric and the most popular app for Firefox OS related to
math is a list of equations [1] that don't use MathML and because of it we can't
try some cool stuffs.

I promised to Frédéric to submit a clone of this popular app that use MathML
that can be use for us to test some features (like copy and paste) and the app
is already available at https://github.com/r-gaia-cs/math-cheat-sheet.

One of the things that I want in this app is be able to search for some equation
and to do it I need a Javascript library.

Since I know that some people in this list work or had work with math search
engines they can provide me with

- a link to the library that I need or
- some references to write the library.

Thanks,
Raniere

[1] https://marketplace.firefox.com/app/math-formulas-lite?src=search
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