Quoting Anne van Kesteren <[EMAIL PROTECTED]>:
In <http://whatwg.org/specs/web-forms/current-work/#relation> I think
the text
on :required and :optional should be clarified so that it is clear that these
pseudo-classes only apply to elements to which the "required" attribute
applies.
It is actually more or less clear. Just not the location I expected it to be.
This is probably because the section is not really consistent in defining the
pseudo-classes. For example, :read-only mentions this explicit: "Matches form
control elements that have the readonly attribute set, and to which the
readonly attribute applies[.]" :required does not: "Matches form control
elements that have the required attribute set." It depends on a statement made
later: "When the definitions above refer to elements that have an
attribute set
on them, they do not refer to elements on which that attribute is
defined not to
apply."
--
Anne van Kesteren
<http://annevankesteren.nl/>
