org.danielnixon.saferdom.implicits.html
If the option is a descendant of a <select> element, then this property has the same value as the form property of the corresponding HTMLSelectElement object; otherwise, it is null.
If the option is a descendant of a <select> element, then this property has the same value as the form property of the corresponding HTMLSelectElement object; otherwise, it is null.
MDN
https://html.spec.whatwg.org/multipage/forms.html#the-option-element