EPUB also includes a method for specifying fallbacks for different kinds of content inside HTML files called Content Switching. (ebookflightdeck.com)
It's the kind of story Woody Allen writes best - examining the relationships between people - love, lust, hate, and how other people get used as fallback positions. (timeout.com)
I will use saves as fallbacks when a game really does get hard and I'm dying again and again: this is along the lines of «The Consequences of Consequences» argument, using saves to debug the difficulty. (electrondance.com)