Top html issues

match the W3C in preferring `footer`s instead of `figcaption`s to give attribution for `blockquote`s in `figure`s

document conformance

Make <label> elements reflect CSS pseudoclasses on associated form element

needs implementer interest normative change

valueAsNumber for type=month should return the number of months since 1970-01?

compat forms

Add equivalent of webkit-playsinline attribute to <video>

additioproposal needs implementer interest media

Cleanup around the HTML parser and how it sniffs encodings

clarification

Deprecate mediagroup/MediaController?

removadeprecation media