Source code
Revision control
Copy as Markdown
Other Tools
Test Info: Warnings
- This test has a WPT meta file that expects 2 subtest issues.
- This WPT test may be referenced by the following Test IDs:
- /css/css-values/tree-counting/sibling-index-keyframe-value-dynamic.html - WPT Dashboard Interop Dashboard
<!DOCTYPE html>
<title>CSS Values and Units Test: sibling-index() changing value during @keyframes animation</title>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
@keyframes --anim {
from {
z-index: sibling-index();
}
to {
z-index: 1;
}
}
#target {
animation: --anim 1000s step-end;
position: relative;
width: 100px;
height: 100px;
background: red;
}
#abs {
position: absolute;
width: 100px;
height: 100px;
z-index: 3;
background: green;
}
</style>
<p>You should see a green square below.</p>
<div>
<div id="rm"></div>
<div id="abs"></div>
<div id="target"></div>
</div>
<script>
test(() => {
assert_equals(getComputedStyle(target).zIndex, "3");
}, "Initially, the sibling-index() is 3 for #target");
test(() => {
rm.remove();
assert_equals(getComputedStyle(target).zIndex, "2");
}, "Removing a preceding sibling of #target reduces the sibling-index()");
</script>