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>
<meta name="viewport" content="width=device-width,initial-scale=1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="./resources/intersection-observer-test-utils.js"></script>
<style>
pre, #log {
position: absolute;
top: 0;
left: 200px;
}
.spacer {
height: calc(100vh + 100px);
}
#root {
display: inline-block;
overflow-y: scroll;
height: 200px;
border: 3px solid black;
}
#target {
width: 100px;
height: 100px;
background-color: green;
}
</style>
<div class="spacer"></div>
<div id="root">
<div style="height: 300px;"></div>
<div id="target"></div>
</div>
<div class="spacer"></div>
<script>
var vw = document.documentElement.clientWidth;
var vh = document.documentElement.clientHeight;
var entries = [];
var root, target;
runTestCycle(function() {
target = document.getElementById("target");
assert_true(!!target, "target exists");
root = document.getElementById("root");
assert_true(!!root, "root exists");
var observer = new IntersectionObserver(function(changes) {
entries = entries.concat(changes)
}, { root: root });
observer.observe(target);
entries = entries.concat(observer.takeRecords());
assert_equals(entries.length, 0, "No initial notifications.");
runTestCycle(step0, "First rAF");
}, "IntersectionObserver in a single document with explicit root.");
function step0() {
document.scrollingElement.scrollTop = vh;
runTestCycle(step1, "document.scrollingElement.scrollTop = window.innerHeight.");
checkLastEntry(entries, 0, [ 11, 111, vh + 411, vh + 511, 0, 0, 0, 0, 11, 111, vh + 111, vh + 311, false]);
}
function step1() {
root.scrollTop = 150;
runTestCycle(step2, "root.scrollTop = 150 with root scrolled into view.");
assert_equals(entries.length, 1, "No notifications after scrolling frame.");
}
function step2() {
document.scrollingElement.scrollTop = 0;
runTestCycle(step3, "document.scrollingElement.scrollTop = 0.");
checkLastEntry(entries, 1, [11, 111, 261, 361, 11, 111, 261, 311, 11, 111, 111, 311, true]);
}
function step3() {
root.scrollTop = 0;
runTestCycle(step4, "root.scrollTop = 0");
checkLastEntry(entries, 1);
}
function step4() {
root.scrollTop = 150;
runTestCycle(step5, "root.scrollTop = 150 with root scrolled out of view.");
checkLastEntry(entries, 2, [11, 111, vh + 411, vh + 511, 0, 0, 0, 0, 11, 111, vh + 111, vh + 311, false]);
}
// This tests that notifications are generated even when the root element is off screen.
function step5() {
checkLastEntry(entries, 3, [11, 111, vh + 261, vh + 361, 11, 111, vh + 261, vh + 311, 11, 111, vh + 111, vh + 311, true]);
}
</script>
|
