summaryrefslogtreecommitdiffstats
path: root/testing/web-platform/tests/css/css-view-transitions/only-child-image-pair.html
blob: 288d496346e3b55585dbb8cffaff826c2f9c2351 (plain)
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
<!DOCTYPE html>
<html class="reftest-wait foo">
<title>View transitions: ensure :only-child is supported on view-transition-image-pair</title>
<link rel="help" href="https://github.com/WICG/view-transitions">
<link rel="author" href="mailto:khushalsagar@chromium.org">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
::view-transition {
  background-color: black;
}
html:only-child {
  background-color: black;
}
:root:only-child {
  background-color: black;
}
:only-child {
  background-color: black;
}
.foo:only-child {
  background-color: black;
}

::view-transition-image-pair(root):only-child {
  background-color: red;
}
::view-transition-image-pair(*):only-child {
  color: red;
}
</style>

<script>
promise_test(() => {
  assert_implements(document.startViewTransition, "Missing document.startViewTransition");
  return new Promise(async (resolve, reject) => {
    let transition = document.startViewTransition();
    transition.ready.then(() => {
      let style = getComputedStyle(
        document.documentElement, ":view-transition-image-pair(root)");
      if (style.backgroundColor == "rgb(255, 0, 0)" && style.color == "rgb(255, 0, 0)")
        resolve();
      else
        reject(style.backgroundColor + " and " + style.color);
    });
  });
}, ":only-child should always match for ::view-transition-image-pair");
</script>