String placeholder

Source 

@DomName('HTMLTextAreaElement.placeholder')
@DocsEditable()
String get placeholder =>
    _blink.BlinkHTMLTextAreaElement.instance.placeholder_Getter_(this);
void placeholder=(String value)

Source 

@DomName('HTMLTextAreaElement.placeholder')
@DocsEditable()
set placeholder(String value) =>
    _blink.BlinkHTMLTextAreaElement.instance.placeholder_Setter_(this, value);