Bugzilla – Bug 992
check that "shortcut" in rel only allowed as "shortcut icon" (case insensitive)
Last modified: 2014-07-14 07:28:55 CEST
from the spec: — the icon keyword may be preceded by the keyword "shortcut". If the "shortcut" keyword is present, it must be come immediately before the icon keyword and the two keywords must be separated by only a single U+0020 SPACE character http://www.whatwg.org/specs/web-apps/current-work/multipage/links.html#rel-icon
https://github.com/validator/syntax/commit/6befdd67ecf87754fc592cc0ac526d5c9c3c3345