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
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
|
<!DOCTYPE html>
<title>CSS Cascade Layers: Empty layer statements before import rules</title>
<link rel="author" href="mailto:xiaochengh@chromium.org">
<link rel="help" href="https://www.w3.org/TR/css-cascade-5/#layering">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id="target"></div>
<div id="reference" style="color: green"></div>
<script>
// In all test cases, the 'color' property value of #target should be green.
const testCases = [
{
title: 'length and item',
style: `
@layer first, second;
@import url(data:text/css,);
@layer second {
#target { color: green; }
}
@layer first {
#target { color: red; }
}
`,
operations: function(sheet) {
assert_equals(sheet.cssRules.length, 4);
assert_equals(sheet.cssRules.item(0).cssText, '@layer first, second;');
assert_equals(sheet.cssRules.item(1).cssText, `@import url("data:text/css,");`);
assert_equals(sheet.cssRules.item(2).cssText,
'@layer second {\n #target { color: green; }\n}');
assert_equals(sheet.cssRules.item(3).cssText,
'@layer first {\n #target { color: red; }\n}');
}
},
{
title: 'insertRule before imports',
style: `
@import url(data:text/css,);
@layer second {
#target { color: green; }
}
@layer first {
#target { color: red; }
}
`,
operations: function(sheet) {
sheet.insertRule('@layer first, second', 0);
}
},
{
title: 'insertRule after imports',
style: `
@layer first, second;
@import url(data:text/css,);
@layer first {
#target { color: red; }
}
`,
operations: function(sheet) {
sheet.insertRule('@layer second { #target { color: green; } }', 2);
}
},
{
title: 'insert other rules to pre-import layer statements fails',
style: `
@layer first, second;
@import url(data:text/css,);
@layer second {
#target { color: green; }
}
@layer first {
#target { color: red; }
}
`,
operations: function(sheet) {
assert_throws_dom('HierarchyRequestError',
() => sheet.insertRule('#target { color: red !important; }', 0));
assert_throws_dom('HierarchyRequestError',
() => sheet.insertRule('#target { color: red !important; }', 1));
}
},
{
title: 'insert other rules before the first layer statement without imports',
style: `
@layer first, second;
@layer second {
#target { color: red !important; }
}
`,
operations: function(sheet) {
sheet.insertRule(`@layer first {
#target { color: green !important; }
}`, 0);
}
},
{
title: 'deleteRule before imports',
style: `
@layer second, first;
@import url(data:text/css,);
@layer first {
#target { color: red; }
}
@layer second {
#target { color: green; }
}
`,
operations: function(sheet) {
sheet.deleteRule(0);
}
},
{
title: 'deleteRule after imports',
style: `
@layer first, second;
@import url(data:text/css,);
@layer second {
#target { color: green; }
}
@layer first {
#target { color: red; }
}
#target {
color: red;
}
`,
operations: function(sheet) {
sheet.deleteRule(4);
}
},
];
const target = document.getElementById('target');
const reference = document.getElementById('reference');
for (let testCase of testCases) {
promise_test(async t => {
let styleElement = document.createElement('style');
styleElement.textContent = testCase.style;
await new Promise(resolve => {
styleElement.onload = resolve;
styleElement.onerror = resolve;
document.head.append(styleElement);
});
let sheet = styleElement.sheet;
try {
testCase.operations(sheet);
assert_equals(getComputedStyle(target).color, getComputedStyle(reference).color);
} finally {
styleElement.remove();
}
}, testCase.title);
}
</script>
|
