Global CSS options with custom properties | @mdo
This is clever—using custom properties to enable if/else logic in CSS.
Link tags: boolean
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Turing Tumble - Build Marble-Powered Computers
Boolean logic manifested in a Turing-complete game
Venn Diagrams as UI Tools « optional.is/required
A very in-depth article on visually representing Boolean logic in an interface. Stick with it; it's worth it.
Is it jeremykeith's Birthday?
You've seen isitchristmas.com, istwitterdown.com and dowebsitesneedtolookexactlythesameineverybrowser.com. Now Gareth Rushgrove has built isitbirthday.com. Subscribe to the RSS feed just in case you were wondering when my birthday is.