File: ElementInternals-reportValidity-delegatesFocus.html

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<!DOCTYPE html>
<title>Custom element with delegatesFocus in Form should show validation message on focus delegated element</title>
<link rel=mismatch href=ElementInternals-reportValidity-delegatesFocus-notref.html>
<link rel=help href=https://html.spec.whatwg.org/C/#report-validity-steps>

<form>
 <input-custom-element></input-custom-element>
</form>

<script>
class InputCustomElement extends HTMLElement {
  constructor() {
    super();

    this.attachShadow({
      mode: "open",
      delegatesFocus: true
    });
    this.shadowRoot.innerHTML = '<input>';
    this.elementInternals = this.attachInternals();
    this.elementInternals.setValidity({valueMissing: true}, 'value missing');
  }

  static get formAssociated() {
    return true;
  }
}

customElements.define("input-custom-element", InputCustomElement);

document.querySelector("form").reportValidity();

</script>