:You can create a sandbox in your user page, by putting /Sandbox into the address bar at the end and editing that. The only reason I pointed it out was to make sure you were (a) aware of the guideline, and (b) that you had an opportunity to justify your edits, to prevent an ovewr-zealous editor deleting it all. As long as people know that it's not going to be permeanant and you're going to use it as a sandbox then it is permitted.