Usage is very straightforward: You just need a <canvas> tag somewhere on your page:
… and some configuration code:
11 May 2012: After reading up about HTML5 localStorage and cache manifests, I have released an “offline” polar clock web app tailored to iOS devices (but still works remarkably well in web browsers and other devices). Add the app to your home screen (or bookmarks) for easier access. Tap on the clock to cycle among the 12-/24-hour and 1-/2-phase modes. The web app is “offline” in that it caches all of the necessary files to your device, so it can run even without an internet connection. Enjoy!