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chromium/third_party/blink/web_tests/external/wpt/web-animations/responsive/columnGap.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 element = document.getElementById('element');
var container = document.getElementById('container');

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

test(function() {
    element.style.fontSize = '10px';
    var player = element.animate([{columnGap: '40px'}, {columnGap: 'calc(40px - 2em)'}], 10);
    player.pause();

    player.currentTime = 5;
    element.style.fontSize = '40px';
    assert_equals(getComputedStyle(element).columnGap, '20px');

    player.currentTime = 7.5;
    assert_equals(getComputedStyle(element).columnGap, '10px');
}, 'column-gap clamped to 0px on keyframes');

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

    player.currentTime = 1000;
    assert_equals(getComputedStyle(element).columnGap, 'normal');

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

    container.style.columnGap = 'normal';
    assert_equals(getComputedStyle(element).columnGap, 'normal');
}, 'column-gap responsive to inherited changes');
</script>