tested in beta-096:

--- code ---
size( 100, 100 );
stroke( #FFFF0000 );
line( 0,0, 100, 100);
--- /code ---

will not compile or run and give no real error-message.

hm, that's not supported, so not providing an error is an issue, but not that it doesn't
work... (though that does give me an idea about how to fix bug #196).

though is this supported by css? if so, is the format ARGB or RGBA? we decided that for
alpha, people can just use the syntax 0xFF000000 the way you do with regular java to
specify hex digits.

changing to WONTFIX, to use alpha with a web/hex color, use:

fill(#FFCC00, 128);

or

fill(0x80FFCC00);