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chromium/third_party/blink/web_tests/external/wpt/web-animations/responsive/text-size-adjust.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 = [
        {textSizeAdjust: 'inherit'},
        {textSizeAdjust: '60%'}
    ];

    container.style.textSizeAdjust = '100%';
    var player = element.animate(keyframes, 20);

    player.pause();
    player.currentTime = 5;
    assert_equals(getComputedStyle(element).textSizeAdjust, '90%');

    player.currentTime = 10;
    container.style.textSizeAdjust = '50%';
    assert_equals(getComputedStyle(element).textSizeAdjust, '55%');
}, 'text-size-adjust responsive to inherited text-size-adjust changes');
</script>