WAI-ARIA 1.1: Links to CSS2

[momdo]

In aria-hidden (state) of section 6.4,

CSS 2 provides a way to select on attribute values ([CSS2]).
This link (http://www.w3.org/TR/1998/REC-CSS2-19980512/selector.html#q10) is too old.

Now the select on attribute values are defined in Selectors Level 3 spec.
http://www.w3.org/TR/css3-selectors/#attribute-selectors

Additionally in section 2.2:

Most modern user agents support CSS attribute selectors ([CSS2])

Then in section F.2:

[CSS2]
Bert Bos; Tantek Çelik; Ian Hickson; Håkon Wium Lie et al. Cascading Style Sheets Level 2 Revision 1 (CSS 2.1) Specification. 7 June 2011. W3C Recommendation. URL: http://www.w3.org/TR/CSS2

Similarly should modify links to Selectors Level 3.

[ZoeBijl]

Work on this in: https://github.com/w3c/aria/tree/feature/issue-117

• 6.4: Link to attribute selector in Level 3.
• 6.4: Remove or update link to CSS2.
• 2.2: Update link.
• 2.2: Remove or update link to CSS2.
• F.2: Remove CSS 2 reference (not linked to anymore after above edits).