FWIW this isn't really TP3, just a skin over a vaguely TP-like compiler - the first thing i did when i pressed E was to type Ctrl+K D to exit the editor and it just focused Firefox's location bar :-P. Then i noticed it was just a regular textarea editor.

But it is indeed a neat minimalistic environment. I used it in a video ~10 years ago to make a simple text based game (i was pretty much improvising the entire thing while i was writing it :-P):

https://www.youtube.com/watch?v=tYwHQpvMZTE

Of course it isn't, I could as well just have mentioned TP 3.0 and leave it there.

However I bothered to try to find out something to show to others.

TP 3.0 was my first Turbo Pascal, I had floppy with it alongside MS-DOS 3.3, to carry around into highschool computer lab.