1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
<!DOCTYPE html>
<html>
<head>
<title>Custom Elements: Changes to the HTML parser</title>
<meta name="author" title="Ryosuke Niwa" href="mailto:rniwa@webkit.org">
<meta name="assert" content="HTML parser must fallback to creating a HTMLUnknownElement when a custom element construction fails">
<link rel="help" href="https://html.spec.whatwg.org/#create-an-element-for-the-token">
<link rel="help" href="https://dom.spec.whatwg.org/#concept-create-element">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<div id="log"></div>
<script>
setup({allow_uncaught_exception:true});
class ReturnsTextNode extends HTMLElement {
constructor() {
super();
return document.createTextNode('some text');
}
};
customElements.define('returns-text', ReturnsTextNode);
class ReturnsNonElementObject extends HTMLElement {
constructor() {
super();
return {};
}
};
customElements.define('returns-non-element-object', ReturnsNonElementObject);
class LacksSuperCall extends HTMLElement {
constructor() { }
};
customElements.define('lacks-super-call', LacksSuperCall);
class ThrowsException extends HTMLElement {
constructor() {
throw 'Bad';
}
};
customElements.define('throws-exception', ThrowsException);
</script>
<returns-text></returns-text>
<returns-non-element-object></returns-non-element-object>
<lacks-super-call></lacks-super-call>
<throws-exception></throws-exception>
<script>
test(function () {
var instance = document.querySelector('returns-text');
assert_false(instance instanceof ReturnsTextNode, 'HTML parser must NOT instantiate a custom element when the constructor returns a Text node');
assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor returns a Text node');
test(function () {
var instance = document.querySelector('returns-non-element-object');
assert_false(instance instanceof ReturnsNonElementObject, 'HTML parser must NOT instantiate a custom element when the constructor returns a non-Element object');
assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor returns non-Element object');
test(function () {
var instance = document.querySelector('lacks-super-call');
assert_false(instance instanceof LacksSuperCall, 'HTML parser must NOT instantiate a custom element when the constructor does not call super()');
assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor does not call super()');
test(function () {
var instance = document.querySelector('throws-exception');
assert_false(instance instanceof ThrowsException, 'HTML parser must NOT instantiate a custom element when the constructor throws an exception');
assert_true(instance instanceof HTMLElement, 'The fallback element created by HTML parser must be an instance of HTMLElement');
assert_true(instance instanceof HTMLUnknownElement, 'The fallback element created by HTML parser must be an instance of HTMLUnknownElement');
}, 'HTML parser must create a fallback HTMLUnknownElement when a custom element constructor throws an exception');
</script>
</body>
</html>
|
