Here are some notes about our HTML5 Canvas Book.  Actually one note:

Use Google Chrome.

Especially for the examples in Chapters 6 and 7 (audio and video), and especially when loading and playing video and audio clips, Google Chrome has the best support right now.  The other chapter examples work great in nearly all browsers, but audio and video support is still inconsistent among browsers.   For example, Firefox 4 appears to have trouble with the “loop” property and the “canplaythrough” event.   We are going to post workarounds as soon as we have them.  Still though,the advice we give at the beginning of the book still holds true:

Use Google Chrome.

That is all.