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<!DOCTYPE html>
<title>form attribute of ElementInternals</title>
<body>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
customElements.define('custom-input-parser', class extends HTMLElement {
static get formAssociated() { return true; }
constructor() {
super();
this.internals_ = this.attachInternals();
}
get i() { return this.internals_; }
});
</script>
<form id="custom-form">
<custom-input-parser id="custom-1"></custom-input-parser>
<custom-input-upgrade id="custom-2"></custom-input-upgrade>
</form>
<custom-input-parser id="custom-3" form="custom-form"></custom-input-parser>
<custom-input-upgrade id="custom-4" form="custom-form"></custom-input-upgrade>
<custom-input-upgrade id="custom-5"></custom-input-upgrade>
<script>
test(() => {
const form = document.forms[0];
assert_equals(document.getElementById("custom-1").i.form, form);
assert_equals(document.getElementById("custom-3").i.form, form);
// Test upgrading.
customElements.define('custom-input-upgrade', class extends HTMLElement {
static get formAssociated() { return true; }
constructor() {
super();
this.internals_ = this.attachInternals();
}
get i() { return this.internals_; }
});
assert_equals(document.getElementById("custom-2").i.form, form);
assert_equals(document.getElementById("custom-4").i.form, form);
// Test changing name attribuate.
let custom5 = document.getElementById("custom-5");
assert_equals(custom5.i.form, null);
custom5.setAttribute("form", "custom-form");
assert_equals(custom5.i.form, form);
}, "ElementInternals.form should return the target element's form owner");
test(() => {
class NotFormAssociatedElement extends HTMLElement {}
customElements.define('not-form-associated-element', NotFormAssociatedElement);
const element = new NotFormAssociatedElement();
const i = element.attachInternals();
assert_throws_dom('NotSupportedError', () => i.form);
}, "ElementInternals.form should throws NotSupportedError if the target element is not a form-associated custom element");
</script>
</body>
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