Show HN: Super Mail Forward, an HTML email that evolves as you forward it
TL;DR: A series of markup and styling hacks that exploit HTML interpretation quirks of various web email services can be hacked to intentionally vary message appearance between services. Coupled with forwarding, which further transforms the email using service-specific quirks, you can make a game where different paths of forwarding across services trigger different appearances.Fun hack! I feel like there should be some clever practical applications but I'm drawing a blank.