@webcomponents/custom-elements
Version:
HTML Custom Elements Polyfill
66 lines (63 loc) • 2.03 kB
HTML
<script src="../resources/testharness.js"></script>
<script src="../resources/testharnessreport.js"></script>
<script src="spec/resources/custom-elements-helpers.js"></script>
<body>
<script>;
test_with_window((w) => {
let doc = w.document;
let e = doc.createElement('a-a');
doc.body.appendChild(e);
var misbehave = true;
var invocations = [];
class X extends w.HTMLElement {
constructor() {
if (misbehave) {
misbehave = false;
invocations.push('misbehaving');
return new X();
}
super();
invocations.push(this);
}
}
w.customElements.define('a-a', X);
assert_array_equals(invocations, ['misbehaving', e],
'returning the existing element should have succeeded');
}, 'HTMLElement constructor: poach but return upgrade candidate');
test_with_window((w) => {
let doc = w.document;
let e = doc.createElement('a-a');
doc.body.appendChild(e);
var misbehave = true;
var invocations = [];
var poacher;
class X extends w.HTMLElement {
constructor() {
if (misbehave) {
misbehave = false;
poacher = new X();
}
try {
super();
invocations.push(this);
} catch (e) {
invocations.push(e);
}
}
}
w.customElements.define('a-a', X);
assert_equals(invocations.length, 2,
'the constructor should have been invoked once for upgrade ' +
'and once for the recursive call to "new"');
assert_equals(poacher, e,
'the recursive "new" should steal the upgrade candidate');
assert_equals(poacher, invocations[0],
'the recursize "new" should happen first');
assert_true(invocations[1] instanceof w.DOMException,
'the super call should have thrown a DOMException');
assert_equals(invocations[1].name, 'InvalidStateError',
'the exception should be an InvalidStateError');
}, 'HTMLElement constructor: poach upgrade candidate');
</script>