<!DOCTYPE html>
<html>
<head>
    <title>ElementInternals.setFormValue(nullish value) should clear submission value</title>
    <link rel="help" href="https://html.spec.whatwg.org/multipage/custom-elements.html#dom-elementinternals-setformvalue">
    <script src="/resources/testharness.js"></script>
    <script src="/resources/testharnessreport.js"></script>
    <script>
        customElements.define("test-form-element", class extends HTMLElement {
            static formAssociated = true;
            const