1. @DomName('HTMLOutputElement.reportValidity')
  2. @DocsEditable()
  3. @Experimental()
bool reportValidity()

Source 

@DomName('HTMLOutputElement.reportValidity')
@DocsEditable()
@Experimental() // untriaged
bool reportValidity() =>
    _blink.BlinkHTMLOutputElement.instance.reportValidity_Callback_0_(this);