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Test Info:

<!doctype html>
<title>Testing if integer interpolation is rounded towards positive infinity</title>
<link rel="author" title="Joonghun Park" href="pjh0718@gmail.com">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
#anim-target {
animation: anim-z 4s steps(4) forwards 1;
animation-delay: -1s;
animation-play-state: paused;
}
@keyframes anim-z {
from {
z-index: -2;
}
to {
z-index: 0;
}
}
</style>
<div id="anim-target"></div>
<script>
var test_description = "Integer interpolation should be rounded towards positive infinity";
test(
t => {
const target = document.getElementById("anim-target");
const z_index_value = Number.parseFloat(getComputedStyle(target).getPropertyValue('z-index'));
assert_equals(z_index_value, -1, "Interpolation result for z-index should be rounded towards positive infinity");
},
test_description
);
</script>