Give focus to an element on startup - or don't?
What's the suggested behavior for giving focus to an element on startup?
I added additional key support to Agamotto. You can now use the left key and the right key to jump from one image to another IF you clicked on the images before or jumped to them using the tab key. I don't focus the content or controls on startup since that's the way that Course Presentation and Interactive Video behave, too. However, some people mentioned that this might be rather uncomfortable and counterintuitive.
Is there a general (web accessibility) rule that applies?