load a local ABC file ('Load a ABC file' button), or
drag & drop a local file from your file manager
or a selected text to the text area.
You may change at will the ABC code in the text area.
Rendering is done 2 seconds later.
The 'Print' button of the browser outputs the rendering area.
You may select part of the tunes either from the text area (click and move)
or from the rendering area.
In the latter case, a left click on a music element defines the
start of the selection, a right click defines the selection end.
If your browser supports playing, a right click outside the music
raises the play menu.