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diff --git a/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-004.html b/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-004.html
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+++ b/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-004.html
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+<!DOCTYPE html>
+<html>
+ <head>
+ <meta charset="utf-8">
+ <title>grid-template-columns neutral keyframe</title>
+ <link rel="help" href="https://drafts.csswg.org/css-grid/#track-sizing">
+ <meta name="assert" content="grid-template-columns supports neutral keyframe.">
+ <script src="/resources/testharness.js"></script>
+ <script src="/resources/testharnessreport.js"></script>
+ <script src="/css/support/interpolation-testcommon.js"></script>
+ </head>
+ <body>
+ <div id="target"></div>
+ <script>
+ test(() => {
+ target.style.gridTemplateColumns = '10px [a] 20px [b]';
+ var animation = target.animate([{}, {gridTemplateColumns: '30px 40px [c]'}], 1000);
+ animation.pause();
+ animation.currentTime = 250;
+ assert_equals(getComputedStyle(target).gridTemplateColumns, '15px [a] 25px [b]');
+ target.style.gridTemplateColumns = '10px 20px [d]';
+ assert_equals(getComputedStyle(target).gridTemplateColumns, '15px 25px [d]');
+ }, 'Invalidate the result for the neutral keyframe if the named lines change.');
+ </script>
+ </body>
+</html> \ No newline at end of file