1 files changed, 26 insertions, 0 deletions
diff --git a/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-001.html b/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-001.html
new file mode 100644
index 0000000000..070539e2c0
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+++ b/testing/web-platform/tests/css/css-grid/animation/grid-template-columns-neutral-keyframe-001.html
@@ -0,0 +1,26 @@
+<!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 = '1fr 200px';
+        var animation = target.animate([{}, {gridTemplateColumns: '30px 300px'}], 1000);
+        animation.pause();
+        animation.currentTime = 500;
+        assert_equals(getComputedStyle(target).gridTemplateColumns, '30px 250px');
+        target.style.gridTemplateColumns = '20px 200px';
+        assert_equals(getComputedStyle(target).gridTemplateColumns, '25px 250px');
+      }, 'Invalidate the result for the neutral keyframe if the value of the <track-breadth> changes.');
+    </script>
+  </body>
+</html>
+\ No newline at end of file