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
|
<!DOCTYPE html>
<title>position-area with fallback and scrolling</title>
<link rel="author" title="Morten Stenshorne" href="mailto:mstensho@chromium.org">
<link rel="help" href="https://drafts.csswg.org/css-anchor-position-1/#scroll">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="support/test-common.js"></script>
<style>
#anchored {
position: absolute;
box-sizing: border-box;
border: solid;
position-anchor: --anchor;
position-try-fallbacks: flip-block, flip-inline, flip-block flip-inline;
position-visibility: always;
width: 50%;
height: 50%;
background: cyan;
}
#container.thicker > .pos {
border-width: thick;
}
</style>
<div style="position:relative; width:500px; height:500px; background:yellow;">
<div id="scrollable" style="overflow: scroll; scrollbar-width: none; width: 500px; height: 500px;">
<div style="width:2000px; height:2000px;">
<div id="container">
<div style="anchor-name:--anchor; margin:200px; width:50px; height:50px; background:gray;"></div>
<div id="anchored" style="position-area:top left;"></div>
</div>
</div>
</div>
</div>
<script>
function assert_rects_equal(elm, x, y, width, height) {
assert_equals(elm.offsetLeft, x, (elm.id + " x"));
assert_equals(elm.offsetTop, y, (elm.id + " y"));
assert_equals(elm.offsetWidth, width, (elm.id + " width"));
assert_equals(elm.offsetHeight, height, (elm.id + " height"));
}
async function redisplay(elm) {
elm.style.display = "none";
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
elm.style.display = "block";
}
promise_test(async() => {
// Start at top left.
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Initial scroll position");
promise_test(async() => {
scrollable.scrollTo(40, 60);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 60, 40, 100, 100);
}, "Scroll to 40,60");
promise_test(async() => {
// Switch to bottom left.
scrollable.scrollTo(100, 200);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 50, 50, 50, 225);
}, "Scroll to 100,200");
promise_test(async() => {
scrollable.scrollTo(0, 0);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 150, 250, 50, 225);
}, "Scroll to 0,0");
promise_test(async() => {
// Switch back to top left.
await redisplay(anchored);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 100, 100, 100, 100);
}, "Redisplay at 0,0");
promise_test(async() => {
// Switch to top right.
scrollable.scrollTo(200, 100);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 50, 50, 225, 50);
}, "Scroll to 200,100");
promise_test(async() => {
// Switch to bottom right.
scrollable.scrollTo(200, 200);
await waitUntilNextAnimationFrame();
await waitUntilNextAnimationFrame();
assert_rects_equal(anchored, 50, 50, 225, 225);
}, "Scroll to 200,200");
</script>
|
