The clinic is getting busy with more HTML5 ailments. This week, we’ll cover server-side validation, immutable images with <canvas>, retrieving drawn objects from a <canvas>, creating custom tags, the role attribute, and the effects of <hgroup> on SEO.

We received the below question from Guy Carberry who was wondering what affect changing the doctype on your HTML or XHTML pages to the HTML 5 doctype will have on those elements that are deprecated current draft.