nl_tokens: https : // dom . spec . whatwg . org / #concept - shadow - including - inclusive - ancestor
pl_tokens: function isShadowInclusiveAncestor ( ancestor , node ) { while ( isNode ( node ) ) { if ( node === ancestor ) { return true ; } if ( isShadowRoot ( <mask> ) ) { node = node . host ; } else { node = domSymbolTree . parent ( node ) ; } } return false ; }