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
|
<!DOCTYPE html>
<html>
<head>
<title> CSS Scroll Snap 2 Test: scroll-initial-target for scroller in shadow DOM</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#scroll-initial-target">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
</head>
<body>
<style>
.space {
width: 50px;
height: 500px;
}
.scroller {
width: 100px;
height: 100px;
overflow: scroll;
border: solid 2px;
}
.purpleborder {
border: solid 2px purple;
}
.target {
scroll-initial-target: nearest;
width: 50px;
height: 50px;
background-color: green
}
#wrapper {
/* Hide everything initially to ensure that the test sees the scroll */
/* events from the scrolls to the scroll-initial-targets. */
display: none;
}
</style>
<div id="wrapper">
<div id="scroller_before" class="scroller">
<div class="space"></div>
<div class="target"></div>
</div>
<div id="shadowDomHost">
<template shadowrootmode="open">
<style>
.space {
width: 50px;
height: 500px;
}
.scroller {
width: 100px;
height: 100px;
overflow: scroll;
border: solid 2px red;
}
.target {
scroll-initial-target: nearest;
width: 50px;
height: 50px;
background-color: green
}
</style>
<slot name="slot1"></slot>
<div id="shadow_scroller" class="scroller">
<div id="space" class="space"></div>
<div id="target" class="target"></div>
</div>
<slot name="slot2"></slot>
</template>
<div id="slot1scroller" slot="slot1" class="purpleborder scroller">
<div id="space" class="space"></div>
<div class="target"></div>
</div>
<div id="slot2scroller" slot="slot2" class="purpleborder scroller">
<div id="space" class="space"></div>
<div class="target"></div>
</div>
</div>
<div id="scroller_after" class="scroller">
<div class="space"></div>
<div class="target"></div>
</div>
</div>
<script>
const scroller_before = document.getElementById("scroller_before");
const slot1scroller = document.getElementById("slot1scroller");
const shadow_scroller =
shadowDomHost.shadowRoot.querySelector(".scroller");
const slot2scroller = document.getElementById("slot2scroller");
const scroller_after = document.getElementById("scroller_after");
const scrollers = [scroller_before, slot1scroller, shadow_scroller,
slot2scroller, scroller_after];
const scroll_log = [];
function setUpLogging() {
let promises = [];
for (const scroller of scrollers) {
promises.push(new Promise((resolve) => {
scroller.addEventListener("scroll", () => {
scroll_log.push(scroller.id);
resolve();
}, { once: true });
}));
}
return Promise.all(promises);
}
function verifyScrollPositions() {
for (const scroller of scrollers) {
// Each scroller's target is at the scroller's very bottom so the
// scroller should be scrolled all the way down.
assert_equals(scroller.scrollTop,
scroller.scrollHeight - scroller.clientHeight,
`${scroller.id} is scrolled to its target`);
}
}
promise_test(async (t) => {
// Arm the promises that should be resolved due to scrolling to the
// scroll-initial-targets.
const scroll_promises = setUpLogging();
const wrapper = document.getElementById("wrapper");
wrapper.style.display = "initial";
await scroll_promises;
// Verify that the order in which the scroll containers were scrolled
// matches flat tree order.
assert_array_equals(scroll_log, ["scroller_before", "slot1scroller",
"shadow_scroller", "slot2scroller", "scroller_after"]);
verifyScrollPositions();
}, "scroll-initial-target in shadow DOM is scrolled to initially.");
</script>
</body>
</html>
|
