HELLO shows when it has run by adding an emoji to the run status line. This is our variation of "hello world".
Our first demo of interactive markup showed HELLO when clicks allowed it to run.
HELLO shows an additional 😀 each time it is run. Add "world" to the block's way for 🌎 instead.
HELLO world
HELLO shows all available state when state.debug is true but does not user or alter any state.