Is there are practice board on Chess.com?

I just wanted to move both white and black pieces around on a practice board to try various strategies.

Is there such a feature on Chess.com?

not that i know of but you can do it on a chess board dont know if that would teach you anything.

Well, say I've seen a new opening on YouTube, and I want to practice it, then it would be useful to have a practice board. I don't yet know all the coordinates of the squares, so my own board is rather slow to use.

dont know if there is such a thing on chess.com just playing against the computer is all ive seen.

Maybe somewhere on the internet? It would help to have an 'intelligent' board, which at least would know about illegal moves.

what does illegal moves mean.

Just found it on chess.com 

Go Learn / Analysis, and you get comments

An illegal move? Moving a Castle diagonally, or a pawn sideways - dozens of illegal moves? Or making a move which leaves the King in check etc.

Actually the practice board has many features.....really useful

but if your playing someone one here they cant make illegal moves comp stops it

Exactly, but I want to practice a sequence of moves myself, and try and memorise. For example, here's an opening trap by Eric Rosen:

https://www.youtube.com/watch?v=oksV18QmCwo&t=38s

theres nothing stopping you making any moves to practice if you do it on a chess board

Which returns to my point about having a board which is marked-up with the coordinates - E4, E5 etc.

Yes

https://www.chess.com/analysis