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Test Info:

<!doctype html>
<meta charset=utf-8>
<title>Form controls' form attribute</title>
<script src=/resources/testharness.js></script>
<script src=/resources/testharnessreport.js></script>
<div id="testcontent">
<form id="form">form</form>
<input id="input" form="form">
</div>
<script>
test(() => {
assert_equals(document.getElementById('input').form,
document.getElementById('form'));
}, "Form control's form attribute should point to the form element.");
test(() => {
var testcontent = document.getElementById("testcontent");
var host = document.createElement("div");
var sr = host.attachShadow({mode: "open"});
sr.innerHTML = testcontent.innerHTML;
var input = sr.getElementById("input");
var form = sr.getElementById("form");
// Should have null form when shadow DOM isn't connected.
assert_equals(input.form, null);
testcontent.appendChild(host);
assert_equals(input.form, form);
host.remove();
assert_equals(input.form, null);
testcontent.appendChild(host);
assert_equals(input.form, form);
input.remove();
assert_equals(input.form, null);
sr.appendChild(input);
assert_equals(input.form, form);
form.id = "foobar";
assert_equals(input.form, null);
form.id = "form";
assert_equals(input.form, form);
form.remove();
assert_equals(input.form, null);
sr.appendChild(form);
assert_equals(input.form, form);
host.remove();
}, "Shadow form control's form attribute should work also in shadow DOM.");
test(() => {
var testcontent = document.getElementById("testcontent");
var host = document.createElement("div");
var sr = host.attachShadow({mode: "open"});
sr.innerHTML = "<form id='form'><input id='input'></form>";
var input = sr.getElementById("input");
var form = sr.getElementById("form");
assert_equals(input.form, form);
input.remove();
assert_equals(input.form, null);
form.appendChild(input);
assert_equals(input.form, form);
form.remove();
assert_equals(input.form, form);
host.remove();
}, "Form element as form control's ancestor should work also in shadow DOM.");
</script>