Form element documentation for 10.3.x does not include any elements

Moving to the API project that generates api.drupal.org.

The reason is because the annotation has changed from:

...
 *
 * @FormElement("checkboxes")
 */
class ...

To:

...
*/
#[FormElement('checkboxes')]
class ...

This might be a duplicate from 🐛 Attributes are not rendered when showing the source code Active , or at the very least has a dependency on it.