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
|
<!doctype html>
<title>::part():lang() invalidation</title>
<link rel="author" title="Keith Cirkel" href="mailto:wpt@keithcirkel.co.uk" />
<link rel="help" href="https://drafts.csswg.org/css-shadow-parts/#part" />
<link rel="help" href="https://github.com/whatwg/html/pull/8467" />
<style>
my-element::part(inner) {
background-color: #ff0000;
}
my-element::part(inner):lang(en) {
background-color: #00ffff;
}
my-element::part(inner):lang(en-GB) {
background-color: #00ff00;
}
my-element::part(inner):lang(fr) {
background-color: #0000ff;
}
</style>
<body>
<my-element id="subject" lang="en"></my-element>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script>
const RED = "rgb(255, 0, 0)";
const GREEN = "rgb(0, 255, 0)";
const BLUE = "rgb(0, 0, 255)";
const AQUA = "rgb(0, 255, 255)";
customElements.define(
"my-element",
class MyElement extends HTMLElement {
connectedCallback() {
this.attachShadow({
mode: "open",
}).innerHTML = `<div part="inner">Test</div>`;
this.elementInternals = this.attachInternals();
}
get inner() {
return this.shadowRoot.querySelector("[part=inner]");
}
},
);
test((t) => {
t.add_cleanup(() => {
subject.inner.removeAttribute("lang");
});
assert_equals(getComputedStyle(subject.inner).backgroundColor, AQUA);
subject.inner.lang = "en-GB";
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
subject.inner.lang = "fr";
assert_equals(getComputedStyle(subject.inner).backgroundColor, BLUE);
subject.inner.lang = "en";
assert_equals(getComputedStyle(subject.inner).backgroundColor, AQUA);
}, "::part():lang() invalidation");
test((t) => {
t.add_cleanup(() => {
subject.inner.removeAttribute("lang");
});
assert_equals(getComputedStyle(subject.inner).backgroundColor, AQUA);
subject.inner.setAttribute("lang", "en-GB");
assert_equals(getComputedStyle(subject.inner).backgroundColor, GREEN);
subject.inner.setAttribute("lang", "en");
assert_equals(getComputedStyle(subject.inner).backgroundColor, AQUA);
subject.inner.setAttribute("lang", "fr");
assert_equals(getComputedStyle(subject.inner).backgroundColor, BLUE);
subject.inner.removeAttribute("lang");
assert_equals(getComputedStyle(subject.inner).backgroundColor, AQUA);
}, "::part():lang() invalidation from setAttribute");
</script>
</body>
|
