Web updates

HTML 72d084b81fa9

Do not allow http-equiv values curated via wiki Unlike the somewhat-successful wiki registry for names, the wiki registry for http-equiv values only contained a single entry, "PICS-Label", which points to a spec that has since been obsoleted, and to our knowledge never had an effect on at least browser user agents. This removes the section allowing such wiki-curated pragma directives. Moving forward, any header-like http-equiv pragmas that affect the processing model for HTML documents must go through the normal process for changing the HTML Standard. Closes As an editorial matter, this also defines keywords for each http-equiv attribute state, and links them appropriately.

Domenic Denicola