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<!DOCTYPE html>
<script src="../../../resources/testharness.js"></script>
<script src="../../../resources/testharnessreport.js"></script>
<style>
#target {
--x: rgb(0, 100, 0);
--red: 0;
--green: 100;
--blue: 200;
background-color: black;
}
</style>
<div id="target"></div>
<script>
test(() => {
var animation = target.animate({backgroundColor: 'var(--x)'}, 1);
animation.pause();
animation.currentTime = 0.25;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 25, 0)');
animation.currentTime = 0.5;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 50, 0)');
animation.currentTime = 0.75;
assert_equals(getComputedStyle(target).backgroundColor, 'rgb(0, 75, 0)');
}, 'var() references can be used for smoothly interpolated animations.');
test(() => {
var animation = target.animate({color: 'rgb(var(--red), var(--green), var(--blue))'}, 1);
animation.pause();
animation.currentTime = 0.25;
assert_equals(getComputedStyle(target).color, 'rgb(0, 25, 50)');
animation.currentTime = 0.5;
assert_equals(getComputedStyle(target).color, 'rgb(0, 50, 100)');
animation.currentTime = 0.75;
assert_equals(getComputedStyle(target).color, 'rgb(0, 75, 150)');
}, 'Multiple var() references can be used for smoothly interpolated animations.');
</script>
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