dart:html

classes property

CssClassSet classes

The set of CSS classes applied to this element.

This set makes it easy to add, remove or toggle the classes applied to this element.

element.classes.add('selected');
element.classes.toggle('isOnline');
element.classes.remove('selected');

Source

CssClassSet get classes => new _ElementCssClassSet(this);

void classes=(Iterable<String> value)

Source

set classes(Iterable<String> value) {
  // TODO(sra): Do this without reading the classes in clear() and addAll(),
  // or writing the classes in clear().
  CssClassSet classSet = classes;
  classSet.clear();
  classSet.addAll(value);
}