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<title>Custom Elements: document.createElementNS must create an element with synchronous custom elements flag set</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="document.createElementNS must create an element with synchronous custom elements flag set">
<link rel="help" content="https://dom.spec.whatwg.org/#dom-document-createelementns">
<link rel="help" content="https://dom.spec.whatwg.org/#concept-create-element">
<script src="../../resources/testharness.js"></script>
<script src="../../resources/testharnessreport.js"></script>
<script src="../../imported/w3c/web-platform-tests/custom-elements/resources/custom-elements-helpers.js"></script>
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<body>
<div id="log"></div>
<script>

const xhtmlNamespaceURI = 'http://www.w3.org/1999/xhtml';

test_with_window((contentWindow, contentDocument) => {
    let constructorArguments;
    class MyCustomElement extends contentWindow.HTMLElement {
        constructor() {
            constructorArguments = Array.from(arguments);
            super();
        }
    }
    contentWindow.customElements.define('my-custom-element', MyCustomElement);
    const instance = contentDocument.createElement('my-custom-element');
    assert_true(instance instanceof MyCustomElement);
    assert_array_equals(constructorArguments, []);
}, 'document.createElement invoke a custom element constructor with no arguments');

test_with_window((contentWindow, contentDocument) => {
    class MyCustomElement extends contentWindow.HTMLElement {};

    const upgradeCandidate = contentDocument.createElementNS(xhtmlNamespaceURI, 'my-custom-element');
    assert_true(upgradeCandidate instanceof contentWindow.HTMLElement);
    assert_false(upgradeCandidate instanceof MyCustomElement);

    contentWindow.customElements.define('my-custom-element', MyCustomElement);
    const instance = contentDocument.createElementNS(xhtmlNamespaceURI, 'my-custom-element');
    assert_true(instance instanceof MyCustomElement);
    assert_equals(instance.localName, 'my-custom-element');
    assert_equals(instance.namespaceURI, xhtmlNamespaceURI);
}, 'document.createElementNS must create an instance of custom elements');

test_with_window((contentWindow, contentDocument) => {
    class MyCustomElement extends contentWindow.HTMLElement {};
    contentWindow.customElements.define('element-with-prefix', MyCustomElement);

    const instance = contentDocument.createElementNS(xhtmlNamespaceURI, 'foo:element-with-prefix');
    assert_true(instance instanceof MyCustomElement);
    assert_equals(instance.localName, 'element-with-prefix');
    assert_equals(instance.namespaceURI, xhtmlNamespaceURI);
    assert_equals(instance.prefix, 'foo');
}, 'document.createElementNS must set the prefix after constructing a custom element');

test_with_window((contentWindow, contentDocument) => {
    let innerElement;
    let innerElementPrefix;
    let outerElement;
    let outerElementPrefix;
    class MyCustomElement extends contentWindow.HTMLElement {
        constructor(isInnerCall) {
            if (isInnerCall) {
                innerElement = super();
                innerElementPrefix = innerElement.prefix;
                return innerElement;
            }
            outerElement = super();
            outerElementPrefix = outerElement.prefix;
            return new MyCustomElement(true);
        }
    }
    contentWindow.customElements.define('custom-element', MyCustomElement);

    const instance = contentDocument.createElementNS(xhtmlNamespaceURI, 'foo:custom-element');
    assert_true(instance instanceof MyCustomElement);
    assert_equals(instance.localName, 'custom-element');
    assert_equals(instance.namespaceURI, xhtmlNamespaceURI);
    assert_equals(instance.prefix, 'foo');
    assert_equals(instance, innerElement, 'document.createElementNS must create an element with the synchronous custom elements flag set');
    assert_equals(innerElementPrefix, null, 'HTML constructor must not set prefix');
    assert_equals(outerElementPrefix, null, 'HTML constructor must not set prefix');
}, 'document.createElementNS must use the element returned by the constructor');

</script>
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