Remove the class value from element, and return true on successful removal.
This is the Dart equivalent of jQuery's removeClass.
bool remove(Object value) {
  _validateToken(value);
  if (value is! String) return false;
  Set<String> s = readClasses();
  bool result = s.remove(value);
  writeClasses(s);
  return result;
}
    © 2012 the Dart project authors
Licensed under the Creative Commons Attribution-ShareAlike License v4.0.
    https://api.dart.dev/stable/2.5.0/dart-svg/AttributeClassSet/remove.html