toString method
String toString(Returns the result of the JavaScript objects toString method.
Source
String toString() {
  return 'Rectangle ($left, $top) $width x $height';
}
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dartlang.org/stable/1.24.3/dart-html/DomRectReadOnly/toString.html