1. Experimental()
bool matchesWithAncestors(String selectors)

Checks if this element or any of its parents match the CSS selectors.

Source 

@Experimental()
bool matchesWithAncestors(String selectors) {
  var elem = this;
  do {
    if (elem.matches(selectors)) return true;
    elem = elem.parent;
  } while(elem != null);
  return false;
}