custom-elements/registries/Element-customElementRegistry.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>
<div id="host-window"><template shadowrootmode="open" shadowrootclonable="true"><a-b></a-b></template></div>
<div id="host-null"><template shadowrootmode="open" shadowrootclonable="true" shadowrootcustomelementregistry=""><a-b></a-b></template></div>
<script>

test(() => {
    assert_equals(document.createElement('div').customElementRegistry, window.customElements);
}, 'customElementRegistry on a newly constrcuted element should return window.customElements by default');

test(() => {
    const sr = document.getElementById('host-window').shadowRoot;
    const ab = sr.querySelector('a-b');
    assert_equals(sr.customElementRegistry, window.customElements);
    assert_equals(ab.customElementRegistry, window.customElements);
}, 'customElementRegistry on an element inside a declarative shadow DOM should return window.customElements by default');

test(() => {
    const sr = document.getElementById('host-null').shadowRoot;
    const ab = sr.querySelector('a-b');
    assert_equals(sr.customElementRegistry, null);
    assert_equals(ab.customElementRegistry, null);
}, 'customElementRegistry on an element inside a declarative shadow DOM with shadowrootcustomelementregistry should return null');

test(() => {
    const clone = document.getElementById('host-null').cloneNode(true);
    const sr = clone.shadowRoot;
    const ab = sr.querySelector('a-b');
    assert_equals(sr.customElementRegistry, null);
    assert_equals(ab.customElementRegistry, null);
}, 'customElementRegistry on a clone of a declarative shadow tree with shadowrootcustomelementregistry should return null');

test((t) => {
    const clone = document.getElementById('host-null').cloneNode(true);
    const ab = clone.shadowRoot.querySelector('a-b');
    document.body.appendChild(ab);
    assert_equals(ab.customElementRegistry, window.customElements);

    const frame = document.createElement('iframe');
    t.add_cleanup(() => frame.remove());
    document.body.appendChild(frame);
    frame.contentDocument.body.append(ab);
    assert_equals(ab.customElementRegistry, frame.contentWindow.customElements);

}, 'customElementRegistry on a clone of a declarative shadow tree with shadowrootcustomelementregistry should return the global registry after getting inserted into a document');

test(() => {
    const sr = document.getElementById('host-null').shadowRoot;
    const ab = sr.querySelector('a-b');
    const registry = new CustomElementRegistry;
    registry.initialize(sr);
    assert_equals(sr.customElementRegistry, registry);
    assert_equals(ab.customElementRegistry, registry);
}, 'customElementRegistry on an element inside a declarative shadow DOM with shadowrootcustomelementregistry should return the scoped registry after calling initialize');

test(() => {
    const registry = new CustomElementRegistry;
    element = document.createElement('div', {customElementRegistry: registry});
    assert_equals(element.customElementRegistry, registry);
}, 'customElementRegistry on a builtin element created by calling createElement on CustomElementRegistry should return the registry');

test(() => {
    const registry = new CustomElementRegistry;
    element = document.createElement('non-existent', {customElementRegistry: registry});
    assert_equals(element.customElementRegistry, registry);
}, 'customElementRegistry on an upgarde candidate created by calling createElement on CustomElementRegistry should return the registry');

test(() => {
    const registry = new CustomElementRegistry;
    element = document.createElement('nonexistent', {customElementRegistry: registry});
    assert_equals(element.customElementRegistry, registry);
}, 'customElementRegistry on an unknown element created by calling createElement on CustomElementRegistry should return the registry');

test(() => {
    const registry = new CustomElementRegistry;
    registry.define('custom-element', class extends HTMLElement { })
    element = document.createElement('custom-element', {customElementRegistry: registry});
    assert_equals(element.customElementRegistry, registry);
}, 'customElementRegistry on a defined custom element created by calling createElement on CustomElementRegistry should return the registry');

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