nl_tokens: https : // dom . spec . whatwg . org / #concept - tree - host - including - inclusive - ancestor
pl_tokens: function isHostInclusiveAncestor ( nodeImplA , nodeImplB ) { for ( const ancestor of domSymbolTree . ancestorsIterator ( nodeImplB ) ) { if ( ancestor === nodeImplA ) { return true ; } } const rootImplB = getRoot ( nodeImplB ) ; if ( rootImplB . _host ) { return isHostInclusiveAncestor ( nodeImplA , rootImplB . _host ) ; } return <mask> ; }