num value

Source 

@DomName('HTMLProgressElement.value')
@DocsEditable()
num get value => _blink.BlinkHTMLProgressElement.instance.value_Getter_(this);
void value=(num value)

Source 

@DomName('HTMLProgressElement.value')
@DocsEditable()
set value(num value) =>
    _blink.BlinkHTMLProgressElement.instance.value_Setter_(this, value);