web-animations/responsive/offset-path.html

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<div id='container'>
    <div id='element'></div>
</div>
<script>

var container = document.getElementById('container');
var element = document.getElementById('element');

test(function() {
    var keyframes = [
        {offsetPath: 'inherit'},
        {offsetPath: 'path("M 0 0 H 200")'}
    ];

    container.style.offsetPath = 'path("M 0 0 H 100")';
    var player = element.animate(keyframes, 10);

    player.pause();
    player.currentTime = 5;
    container.style.offsetPath = 'path("M 0 0 H 400")';
    assert_equals(getComputedStyle(element).offsetPath, 'path("M 0 0 H 300")');
}, 'offset-path responsive to inherited offset-path changes');

</script>