Use https:// for spec.whatwg.org (http:// redirects)
Use https:// for www.w3.org/Bugs/Public (http:// redirects)
Update CSS spec references (css3-* redirects to css-*)

The titles and editors have also changed, so update that as well.
Update DOM reference

E.g. https://encoding.spec.whatwg.org calls it just "DOM".
Change IndexSizeError reference from DOM to Web IDL
Add www to google.com (it redirects)