bool checked

Source 

@DomName('HTMLMenuItemElement.checked')
@DocsEditable()
@Experimental() // untriaged
bool get checked =>
    _blink.BlinkHTMLMenuItemElement.instance.checked_Getter_(this);
void checked=(bool value)

Source 

@DomName('HTMLMenuItemElement.checked')
@DocsEditable()
@Experimental() // untriaged
set checked(bool value) =>
    _blink.BlinkHTMLMenuItemElement.instance.checked_Setter_(this, value);