If you’ve used GMail, Google Calendar, or other Google web apps on the iPhone, you’ve probably noticed that they store the app code in a local cache. Only the messages (or day’s events, or other dynamic data) are fetched when you load the app. This is because they use HTML5’s capabilities for offline caching.

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Wondering why the heck is up with the HTML “rel” property, used for stylesheets, RSS feeds, and nofollow? Yeah, me too. Mark Pilgrim is nice enough to lay it all out for us. Turns out this little attribute is more consistent, and has a lot more uses, than you may have guessed.