src/third_party/web_platform_tests/shadow-dom/Element-interface-attachShadow.html

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<head>
<title>Shadow DOM: Attaching a ShadowRoot</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="Element.prototype.attachShadow should create an instance of ShadowRoot">
<link rel="help" href="https://w3c.github.io/webcomponents/spec/shadow/#widl-Element-attachShadow-ShadowRoot-ShadowRootInit-shadowRootInitDict">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<link rel='stylesheet' href='/resources/testharness.css'>
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<div id="log"></div>
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test(function () {
    assert_true('attachShadow' in Element.prototype, 'Element.prototype.attachShadow must exist');
    assert_equals(typeof(document.createElement('div').attachShadow), 'function', 'An instance of div must have attachShadow which is a function');
}, 'Check the existence of Element.attachShadow');

test(function () {
    assert_false('attachShadow' in Node.prototype, 'Node.prototype.attachShadow must not exist');
    assert_false('attachShadow' in CharacterData.prototype, 'CharacterData.prototype.attachShadow must not exist');
    assert_false('attachShadow' in Comment.prototype, 'Comment.prototype.attachShadow must not exist');
    assert_equals(typeof(document.createComment('').attachShadow), 'undefined', 'An instance of comment must not have attachShadow');
    assert_false('attachShadow' in Document.prototype, 'Document.prototype.attachShadow must not exist');
    assert_equals(typeof(document.attachShadow), 'undefined', 'An instance of document must not have attachShadow which is a function');
    assert_false('attachShadow' in DocumentFragment.prototype, 'DocumentFragment.prototype.attachShadow must not exist');
    assert_equals(typeof((new DOMParser()).parseFromString('', 'text/html').attachShadow), 'undefined', 'An instance of document must not have attachShadow which is a function');
    assert_false('attachShadow' in Text.prototype, 'Text.prototype.attachShadow must not exist');
    assert_equals(typeof(document.createTextNode('').attachShadow), 'undefined', 'An instance of text node must not have attachShadow');
}, 'Nodes other than Element should not have attachShadow');

test(function () {
    assert_throws({'name': 'TypeError'}, function () {
        document.createElement('div').attachShadow({})
    }, 'attachShadow must throw a TypeError when mode is omitted');

    assert_throws({'name': 'TypeError'}, function () {
        document.createElement('div').attachShadow({mode: true})
    }, 'attachShadow must throw a TypeError when mode is a boolean');

    assert_throws({'name': 'TypeError'}, function () {
        document.createElement('div').attachShadow({mode: 1})
    }, 'attachShadow must throw a TypeError when mode is 1');
}, 'Element.attachShadow must throw a TypeError if mode is not "open" or "closed"');

test(function () {
    assert_true(document.createElement('div').attachShadow({mode: "open"}) instanceof ShadowRoot,
        'attachShadow({mode: "open"}) should create an instance of ShadowRoot');
    assert_true(document.createElement('div').attachShadow({mode: "closed"}) instanceof ShadowRoot,
        'attachShadow({mode: "closed"}) should create an instance of ShadowRoot');
}, 'Element.attachShadow must create an instance of ShadowRoot');

test(function () {
    assert_throws({'name': 'InvalidStateError'}, function () {
        var div = document.createElement('div');
        div.attachShadow({mode: "open"});
        div.attachShadow({mode: "open"});
    }, 'Calling attachShadow({mode: "open"}) twice on the same element must throw');

    assert_throws({'name': 'InvalidStateError'}, function () {
        var div = document.createElement('div');
        div.attachShadow({mode: "closed"});
        div.attachShadow({mode: "closed"});
    }, 'Calling attachShadow({mode: "closed"}) twice on the same element must throw');

    assert_throws({'name': 'InvalidStateError'}, function () {
        var div = document.createElement('div');
        div.attachShadow({mode: "open"});
        div.attachShadow({mode: "closed"});
    }, 'Calling attachShadow({mode: "closed"}) after attachShadow({mode: "open"}) on the same element must throw');

    assert_throws({'name': 'InvalidStateError'}, function () {
        var div = document.createElement('div');
        div.attachShadow({mode: "closed"});
        div.attachShadow({mode: "open"});
    }, 'Calling attachShadow({mode: "open"}) after attachShadow({mode: "closed"}) on the same element must throw');
}, 'Element.attachShadow must throw a InvalidStateError if the context object already hosts a shadow tree');

test(function () {
    for (var elementName of ['button', 'details', 'input', 'marquee', 'meter', 'progress', 'select', 'textarea', 'keygen']) {
        assert_throws({'name': 'NotSupportedError'}, function () {
            document.createElement(elementName).attachShadow({mode: "open"});
        }, 'Calling attachShadow({mode: "open"}) on ' + elementName + ' element must throw');

        assert_throws({'name': 'NotSupportedError'}, function () {
            document.createElement(elementName).attachShadow({mode: "closed"});
        }, 'Calling attachShadow({mode: "closed"}) on ' + elementName + ' element must throw');
    }
}, 'Element.attachShadow must throw a NotSupportedError for button, details, input, marquee, meter, progress, select, textarea, and keygen elements');

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