String protocol

Source 

@DomName('URL.protocol')
@DocsEditable()
@Experimental() // untriaged
String get protocol => _blink.BlinkURL.instance.protocol_Getter_(this);
void protocol=(String value)

Source 

@DomName('URL.protocol')
@DocsEditable()
@Experimental() // untriaged
set protocol(String value) =>
    _blink.BlinkURL.instance.protocol_Setter_(this, value);