Is this possible, and if so, is it against the guidelines?

I have an idea for a program in HTML, but I'm not sure if it would violate the Guidelines.

I would like to make a program that uses the Khan Academy API (if it still exists, it's been a while since I've seen any updates on it) or something similar to access the comments on it. It would then look at the content of the comment, and based on the content, change the color of a square on-screen, such that if someone comments "255, 0, 0" and refreshes the page, the square will turn red.

Is this possible and/or a violation of the Guidelines?