Flash 10 versus JS / HTML5: The Tour Guide

I have seen an enormous amount of uninformed speculation regarding what the Flash and JS/HTML5 platforms are each capable of as of right now(February 2010). This post is an attempt to comprehensively round up the differences by going through the Flash API and filtering through it to create a “FAQ” of features worthy of direct comparison, with the focus being “what does Flash offer that is not covered in existing or proposed spec?”. [...]