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<!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;
constructor() {
super();
this.i = this.attachInternals();
}
});
</script>
</head>
<body>
<form id="form-null">
<test-form-element id="input-null" name="input-null"></test-form-element>
</form>
<form id="form-undefined">
<test-form-element id="input-undefined" name="input-undefined"></test-form-element>
</form>
<script>
test(() => {
const input = document.getElementById("input-null");
input.i.setFormValue("fail");
input.i.setFormValue(null);
const formData = new FormData(document.getElementById("form-null"));
assert_false(formData.has("input-null"));
}, "ElementInternals.setFormValue(null) clears submission value");
test(() => {
const input = document.getElementById("input-undefined");
input.i.setFormValue("fail");
input.i.setFormValue(undefined);
const formData = new FormData(document.getElementById("form-undefined"));
assert_false(formData.has("input-undefined"));
}, "ElementInternals.setFormValue(undefined) clears submission value");
</script>
</body>
</html>
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