Support for HTML5 roles

[aniketpant]

I was going through ​http://core.svn.wordpress.org/trunk/wp-includes/kses.php and I realized that most of the new HTML5 tags have been introduced but role is a missing attribute.

I feel that since WordPress has already made a move towards HTML5 by supporting <article>, <section> and other tags, all attributes should be made available too. role should be added to the required tags falling under $allowedposttags.

Go through the link for more information on ​roles.

[kraftbj]

I think this is better classified as a Accessibility component as the role attribute since it is in the HTML5 spec as coming from the WAI-ARIA spec. ( ​http://www.w3.org/TR/wai-aria/roles ).

To that end, it should be added to $allowedposttags, likely in 3.7. I'll work up a patch when 3.6 drops, if no one else does before.

[mikecorkum]

I added the the role attribute to all values. This seems a little ridiculous but but according to ​W3C Section 3.2.7.1 any HTML element should be able to use role. Perhaps this isn't realistic, and we should just apply it to the elements that commonly have a role defined. Thoughts?

[kraftbj]

My apologies Mike if I led you astray on my last comment. If we're going to add it to all HTML, should it go in $global_attributes instead (in the _wp_add_global_attributes() at the end of kses.php instead?

It makes sense to me to add it there—you want to take it?

[mikecorkum]

Added role to global attributes

[mikecorkum]

I totally agree, that makes WAY more sense - I didn't even know that was there. See the updated diff, i've made the change.

[nacin]

Seems OK to me. We will want to confirm there are no security implications of this.

[nacin]

In 27388:

Allow the role attribute in kses for all elements.

props mikecorkum.
fixes #24098.