[VE][html5] Add Subject Here

Validating http://prog.bhstudios.org/prog/SSCCE/css3/accordion/
Error [html5]: "Attribute label not allowed on element menu at this point."
Contradicition (in bold):

*Line 45, Column 51*: *Attribute label not allowed* on element menu at this
point.

  <MENU TYPE="toolbar" LABEL="Item 2 (expandable)">

*Attributes *for element
menu<http://www.w3.org/html/wg/drafts/html/master/single-page.html#the-menu-element>
:Global attributes<http://www.w3.org/html/wg/drafts/html/master/single-page.html#global-attributes>
type<http://www.w3.org/html/wg/drafts/html/master/single-page.html#attr-menu-type>
*label*<http://www.w3.org/html/wg/drafts/html/master/single-page.html#attr-menu-label>