Replace/add spec links in css

[mhulse]

Various "short" link options:

W3C:

• http://w3.org/html/wg/drafts/html/master/#week-state-(type=week)
• http://dev.w3.org/html5/spec/Overview.html#week-state-(type=week)

  WHATWG HTML Living Standard

• http://whatwg.org/html/#week-state-(type=week)
• http://whatwg.org/C#week-state-(type=week)
• http://ç.whatwg.org#week-state-(type=week)
• http://whatwg.org/c#week-state-(type=week)
• http://c.whatwg.org#week-state-(type=week) (single-page version)

Both are probably worth linking to, yet I think I prefer linking to the living standard.

Discussion here:

[html5] W3C doc links? Shortcut urls?

[mhulse]

Lovin' these two shortcut URLs:

• http://dev.w3.org/html5/spec#the-body-element
• http://ç.whatwg.org#the-body-element

[mhulse]

Should probably make sure everything has a link to MDN too. Maybe caniuse.com as well? All four are so useful.

[mhulse]

Some Mozilla link options:

• https://developer.mozilla.org/en-us/docs/web/html/element/article
• https://developer.mozilla.org/search?q=article