support selectors from CSS Scoping Module Level 1 Nov 21 draft     :scope     :scope-context()     :host     :host()     :host-context()     ::shadow     ::content     ::region     /deep/ combinator
support selectors from CSS Scoping Module Level 1 Nov 21 draft
    :scope
    :scope-context()
    :host
    :host()
    :host-context()
    ::shadow
    ::content
    ::region
    /deep/ combinator

y0ssar1an/CSS3