syntax clear
:syntax keyword, :syntax match and :syntax region are: conceal, cchar, contained, containedin, nextgroup, transparent, skipwhite, skipnl and skipempty. :syntax match and :syntax region can additionially specify contains, fold, display, extend. :syntax region can additionially specify oneline and concealends. :help syn-arguments syntax keyword {group-name} [{options}] {keyword} .. [{options}]
:syntax spell toplevel
:syntax keyword
FEAT_CONCEAL.