How to use this app??

Question

I tried to use to test my code but something that not is right like css, html, java and javascript. I dunno if its updated in code or not

Answer 1

Click on Code from bottom option bar .
Click on +.
Choose a proper langUage
(Select web for html,css,js).
Write proper code And run it .
If any error found save it and link it in question .
You will get better response.