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Test Info:
- This WPT test may be referenced by the following Test IDs:
- /shadow-dom/Element-interface-attachShadow.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<html>
<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>
<script src='../html/resources/common.js'></script>
</head>
<body>
<div id="log"></div>
<script>
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_js(TypeError, function () {
document.createElement('div').attachShadow({})
}, 'attachShadow must throw a TypeError when mode is omitted');
assert_throws_js(TypeError, function () {
document.createElement('div').attachShadow({mode: true})
}, 'attachShadow must throw a TypeError when mode is a boolean');
assert_throws_js(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_dom('NotSupportedError', 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_dom('NotSupportedError', 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_dom('NotSupportedError', 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_dom('NotSupportedError', 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 NotSupportedError if the context object already hosts a shadow tree');
test(function () {
for (var elementName of HTML5_SHADOW_DISALLOWED_ELEMENTS) {
assert_throws_dom('NotSupportedError', function () {
document.createElement(elementName).attachShadow({mode: "open"});
}, 'Calling attachShadow({mode: "open"}) on ' + elementName + ' element must throw');
assert_throws_dom('NotSupportedError', function () {
document.createElement(elementName).attachShadow({mode: "closed"});
}, 'Calling attachShadow({mode: "closed"}) on ' + elementName + ' element must throw');
}
}, 'Element.attachShadow must throw a NotSupportedError for non-safelisted elements');
</script>
</body>
</html>