I made my own IDE (UPDATE (4))
so pppl have tried making repl before but i was thinking about it to so here it is. just type a name into input hit create and then your in the editor, then type your html code into the box and hit save + run then it will redirect you to the output :) currently anyone can edit anyone but accounts may be in the future report any bugs in the comments.
P.S. the db will be wiped if it is abused and is not garenteed to stay
UPDATE 1: using ace editor now
UPDATE 2: added generate no name repl (puts three words together like repl does) and also on all /repl/<name> paths you can do /repl/<name>/__repl to get the editor also save + run uses new tab now
UPDATE 3: the client (editor) and server (Storage and display) are Starting to be separated (nothing will really change for users except new url path for editor) (FULLY RELEASED)
UPDATE 4: added more security to preview Iframe finished redirects
NEXT: preview window save button (no run)