Return the id of the form containing the <input type="week"> element:
The result of x will be:
The form property returns a reference to the form containing the week field.
This property returns a form object on success.
Note: This property is read only.
The form property is supported in all major browsers.
Note: The <input type="week"> element is not supported in Internet Explorer or Firefox.
|Return Value:||A reference to the form element containing the week field. If the week field is not in a form, null is returned|