A form-associated custom element with `static formAssociated = true` never calls `setValidity` at all. When `form.checkValidity()` runs and `form.reportValidity()` is invoked, how is this element treated in constraint validation?
class MyEl extends HTMLElement {
static formAssociated = true;
constructor(){ super(); this.internals = this.attachInternals(); }
// setValidity is never called
}