Its missing something.... you have some of the functions to ready input... But you dont have the quick descriptions, Put in quick descriptions or examples and stuff, Give it more of a feel... Also, Make it so you can only bookmark a line once, and when you bookmark the line again with the same bookmark it "Unbookmarks it", and if its a different bookmark it changes the bookmark to the new clicked bookmark, if ya know what i mean...
Other than that nice editor 😉