LayoutTests/webanimations/scheduling-of-animation-with-steps-timing-function-on-effect.html

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

promise_test(async t => {
    const animation = document.querySelector("div").animate({ marginLeft: "100px" }, { duration: 1000, easing: "steps(10)" });

    await animation.ready;

    animation.currentTime = 225;
    assert_equals(internals.timeToNextAnimationTick(animation), 75, "Computing the time until the next tick when partly through a steps interval.");
}, "Computing the time until the next tick for an effect with a steps() easing.");

</script>