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chromium/third_party/blink/web_tests/external/wpt/web-animations/responsive/baselineShift.html 

<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<svg>
  <text>
    <tspan id='container'>
      <tspan id='element'></tspan>
    </tspan>
  </text>
</svg>

<script>
var element = document.getElementById('element');
var container = document.getElementById('container');

test(function() {
    element.style.fontSize = '10px';
    var player = element.animate([{baselineShift: '3em'}, {baselineShift: '5em'}], 10);
    player.pause();
    player.currentTime = 5;
    element.style.fontSize = '20px';
    assert_equals(getComputedStyle(element).baselineShift, '80px');
}, 'baselineShift responsive to style changes');

test(function() {
    container.style.baselineShift = 'sub';
    var player = element.animate([{baselineShift: 'inherit'}, {baselineShift: '20px'}], 4000);
    player.pause();

    player.currentTime = 1000;
    assert_equals(getComputedStyle(element).baselineShift, 'sub');

    container.style.baselineShift = 'super';
    assert_equals(getComputedStyle(element).baselineShift, 'super');

    container.style.baselineShift = '100px';
    assert_equals(getComputedStyle(element).baselineShift, '80px');

    container.style.baselineShift = 'sub';
    assert_equals(getComputedStyle(element).baselineShift, 'sub');
}, 'baselineShift responsive to inherited changes');
</script>