The alt-e command erases the score text and notation.

Pressing alt-e will erase both the text and graphical forms of the a score from the VHV editor. Pressing alt-e when the editor is empty will restore the score in case it was erased by accident.

toggling erasing.
Erasing a score from the VHV editor.

URL suppression of demo score

The demo score that shows when the VHV editor is first opened can be suppressed by adding ?k=e to the VHV URL:

suppressing sample data from URL.
Suppressing sample score via URL.