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+<!DOCTYPE html>
+<meta charset="utf-8">
+<title>CSS Box Alignment Test: gap test animation</title>
+<link rel="author" title="Manuel Rego Casasnovas" href="mailto:rego@igalia.com">
+<link rel="help" href="https://www.w3.org/TR/css-align-3/#column-row-gap">
+<link rel="help" href="https://www.w3.org/TR/css-animations-1/#keyframes">
+<meta name="assert" content="This test checks that gap property is interpolable for each longhand (row-gap and column-gap) independently.">
+<script src="/resources/testharness.js"></script>
+<script src="/resources/testharnessreport.js"></script>
+<style>
+  @keyframes gap-100-200-to-200-400 {
+    from { gap: 100px 200px; }
+    to { gap: 200px 400px; }
+  }
+
+  #target {
+    animation-name: gap-100-200-to-200-400;
+    animation-timing-function: linear;
+    animation-duration: 2s;
+    animation-delay: -1s;
+    animation-play-state: paused;
+  }
+</style>
+<body>
+  <div id="target"></div>
+  <div id="log"></div>
+
+  <script>
+    test(
+      function(){
+        var target = document.getElementById("target");
+        assert_equals(getComputedStyle(target).gap, "150px 300px");
+        assert_equals(getComputedStyle(target).rowGap, "150px");
+        assert_equals(getComputedStyle(target).columnGap, "300px");
+      }, "gap is interpolable");
+  </script>
+</body>