1. DomName('Selection.containsNode')
  2. DocsEditable()
  3. Experimental()
bool containsNode(Node node, bool allowPartial)

Source 

@DomName('Selection.containsNode')
@DocsEditable()
@Experimental() // non-standard
bool containsNode(Node node, bool allowPartial) => _blink.BlinkSelection.instance.containsNode_Callback_2_(unwrap_jso(this), unwrap_jso(node), allowPartial);