custom-elements/registries/ShadowRoot-innerHTML.html

<!DOCTYPE html>
<html>
<head>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<link rel="help" href="https://github.com/whatwg/html/issues/10854">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<script>

function createConnectedShadowTree(test, customElementRegistry) {
    const host = document.createElement('div');
    const shadowRoot = host.attachShadow({mode: 'closed', customElementRegistry});
    document.body.appendChild(host);
    test.add_cleanup(() => host.remove());
    return shadowRoot;
}

test((test) => {
    const registry = new CustomElementRegistry;

    class SomeElement extends HTMLElement { };
    registry.define('some-element', SomeElement);

    class OtherElement extends HTMLElement { };
    registry.define('other-element', OtherElement);

    const shadowRoot = createConnectedShadowTree(test, registry);
    assert_true(document.createElement('some-element', {customElementRegistry: registry}) instanceof SomeElement);
    assert_true(document.createElement('other-element', {customElementRegistry: registry}) instanceof OtherElement);
    shadowRoot.innerHTML = '<some-element></some-element><other-element></other-element>';

    assert_true(shadowRoot.querySelector('some-element') instanceof SomeElement);
    assert_equals(shadowRoot.querySelector('some-element').customElementRegistry, registry);
    assert_true(shadowRoot.querySelector('other-element') instanceof OtherElement);
    assert_equals(shadowRoot.querySelector('other-element').customElementRegistry, registry);
}, 'innerHTML on a shadow root should use the scoped registry');

test((test) => {
    class SomeElement1 extends HTMLElement { };
    customElements.define('some-element', SomeElement1);

    const registry = new CustomElementRegistry;
    class SomeElement2 extends HTMLElement { };
    registry.define('some-element', SomeElement2);

    const shadowRoot = createConnectedShadowTree(test, registry);
    shadowRoot.innerHTML = '<some-element></some-element>';
    assert_true(shadowRoot.querySelector('some-element') instanceof SomeElement2);
    assert_equals(shadowRoot.querySelector('some-element').customElementRegistry, registry);
}, 'innerHTML on a connected shadow root should use the associated scoped registry');

test((test) => {
    const registry = new CustomElementRegistry;
    class SomeElement extends HTMLElement { };
    registry.define('some-element', SomeElement);
    const shadowRoot = createConnectedShadowTree(test, registry);

    shadowRoot.innerHTML = '<some-element></some-element><template><some-element></some-element></template>';
    assert_equals(shadowRoot.querySelector('some-element').__proto__.constructor.name, 'SomeElement');
    assert_equals(shadowRoot.querySelector('some-element').customElementRegistry, registry);
    assert_equals(shadowRoot.querySelector('template').content.querySelector('some-element').__proto__.constructor.name, 'HTMLElement');
    assert_equals(shadowRoot.querySelector('template').content.querySelector('some-element').customElementRegistry, null);
}, 'innerHTML on a connected shadow root should not upgrade a custom element inside a template element');

test((test) => {
    const registry = new CustomElementRegistry;
    const shadowRoot = createConnectedShadowTree(test, registry);
    shadowRoot.innerHTML = '<someelement></someelement>';
    assert_equals(shadowRoot.querySelector('someelement').__proto__.constructor.name, 'HTMLUnknownElement');
    assert_equals(shadowRoot.querySelector('someelement').customElementRegistry, registry);
}, 'innerHTML on a connected shadow root should be able to create an unknown element');

</script>
</body>
</html>