[wp-trac] [WordPress Trac] #17632: HTML 5 Validation issues (theme independent)
wp-trac at lists.automattic.com
Fri Mar 30 01:40:47 UTC 2012
#17632: HTML 5 Validation issues (theme independent)
Reporter: amirhabibi | Owner:
Type: defect (bug) | Status: new
Priority: normal | Milestone: Awaiting Review
Component: General | Version: 3.1.3
Severity: normal | Resolution:
Keywords: has-patch |
Comment (by pbiron):
[http://core.trac.wordpress.org/ticket/17632#comment:16 @Maventus]: I
replied  to your questions in that support thread, before I saw your
note here. You've probably already seen it.
thanx for the explanation about the relevance of the check for
`$wp_request->using_permalinks()`! That's '''very''' helpful background.
However, the rel-tag spec  is no longer relevant, at least in the
context of HTML5. The fact that `@rel='tag'` is listed in the table in
the ''formats'' section  of the microformats wiki (with a link to )
doesn't make it normative for HTML5, which gives it's own definition for
`@rel='tag'` that supersedes anything else and explicitly references the
table in the ''HTML5 link type extensions'' section  as being normative
for values not defined within itself.
re: my concern about `@rel='tag'` being used for links within a document
containing posts from many different categories, I see that the rel-tag
spec contains the following language:
Note that a tag may just refer to a major portion of the
current page (i.e. a blog post)
So, with that interpretation (and based on what you said about `?tag=foo`
was in the mind of whoever wrote the code that generates `@rel='tag'`), I
don't see (much of) a problem with `@rel='tag'` being used in a document
containing posts from many different categories.
But, as I said above, HTML5 does not rely on the rel-tag spec  for the
semantics of `@rel='tag'`, it defines its own. HTML5 also contains the
following non-normative note after it's definition of `@rel='tag'`:
Note: Since it indicates that the tag applies to the current document,
it would be inappropriate to use this keyword in the markup of a tag
cloud, which lists the popular tags across a set of pages.
which is where my trepidation about it's use on a home page came from (and
that trepidation extends to by-date or by-author archives and anywhere
else posts from multiple categories could appear).
Your point about it's use within the context of `article` is interesting,
since the HTML5 spec says :
The article element represents a self-contained composition in a
document, page, application, or site and that is, in principle,
independently distributable or reusable, e.g. in syndication.
This could be a forum post, a magazine or newspaper article,
a blog entry, a user-submitted comment, an interactive widget
or gadget, or any other independent item of content.
Which, while non-normative, could be used to justify a request to the
HTML5 WG that they loosen the definition of @rel='tag' to include not only
`documents` but also such "self-contained compositions...". I'll talk to
folks on the W3C HTML5 WG about whether they think that would be
But even if they do make such a change (and hence,
`article//a[@rel*='tag']` having the correct semantics when other
`article`'s in the same document are assigned to different categories, my
suggestion to parameterize `get_the_category_list()` still applies because
there is nothing to prevent it being called outside of that context.
But your point about opening another ticket about that is well taken and I
didn't mean to co-opt this one on that point. But, I'm tired and will
open that other ticket tomorrow.
My purpose in what I have said in this ticket (and the support thread )
has only been to point out that `@rel='category'` is not, in your words,
"obsolete and invalid in html5", if only it's use were documented and that
the patch should '''not''' be applied, at least until the semantics of the
use of `@rel='tag'` in a "multi-category" context are clarified: replacing
one incorrect usage with another incorrect usage just to get validators to
shut up is '''not''' the right thing to do.
 http://microformats.org/wiki/rel-tag#Tag_Spaces [[BR]]
 http://microformats.org/wiki/existing-rel-values#formats [[BR]]
 http://dev.w3.org/html5/spec/single-page.html#link-type-tag [[BR]]
Ticket URL: <http://core.trac.wordpress.org/ticket/17632#comment:18>
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