Welcome to the most minimalistic coding environment ever created!
Source: tixy.land
It took me awhile to wrap my head around tixy.land, but the author’s Twitter announcement thread helps.
Basically, you have one line of up to 32 characters at the bottom of the screen where you write your code. The math of the examples is above my head, but maybe some math teachers can use this site in their class.
Be sure to check out the Twitter thread for more examples and tips on using the site. For example, you can export animated gifs of your creation.