Also a note: trailing commas with multiple-line arrays is a good idea and has a purpose. Trailing commas in inline array definitions doesn't have any benefits and looks weird :)
Add HTML5 support for WordPress galleries.
Man, you're quick! :)
For themes we release to .org we try to maintain backwards compatibility with the latest two versions of WordPress. Let's keep styles for definition lists around for now, what do you think?
Maintain backwards compatibility for non-HTML5 galleries.
Agree. See 9b0ae42
I think we may want to add a comment in the CSS to remind devs why the definition list is in there. See: MachoThemes/decode@5323e90