Tis a shame, there are far more comprehensive and impressive displays of what Code Mirror can do than this. CodeMirror makes the OP's link extremely trivial to

Tis a shame, there are far more comprehensive and impressive displays of what Code Mirror can do than this. CodeMirror makes the OP's link extremely trivial to implement. edit: Sorry, this isn't meant to be a dig on the Google's Code Editor as much as it's meant to be praise of how impressive I find CodeMirror (and it's competitor/friend Ace).