Hugo Giraudel:
Outline Audit is a small JavaScript program that analyses the document outline of the current page, and emits warnings in the developer console when something looks odd.
I tried Hugos Outline Audit tool, packaged as a bookmarklet. It works as advertised and thus it will be part of my toolbelt from now on. Thank you, Hugo!
Even if you are not interested in the tool itself the article contains some very useful information about the document outline and the current state of assistive technologies regarding HTML5 elements.
