Automatically send a string in the form of a downloaded file to a browser client using new HTML5 anchor attributes.

download_string.dart

void downloadFileToClient(String filename, String text) {
  AnchorElement tempLink = document.createElement('a');
  tempLink
  ..attributes['href'] = 'data:text/plain;charset=utf-8,${Uri.encodeComponent(text)}'
  ..attributes['download'] = filename
  ..click();
}