css/css-multicol/multicol-gap-animation-003.html

<!DOCTYPE html>
<meta charset="utf-8">
<title>CSS Multi-column Layout Test: Default column-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-multicol-1/#column-gap">
<link rel="help" href="https://www.w3.org/TR/web-animations-1/#dom-animatable-animate">
<meta name="assert" content="Test checks that the default value for column-gap property, which is 'normal', is not interpolable.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<style>
  @keyframes column-gap-to-100 {
    to { column-gap: 100px; }
  }

  #multicol {
    animation-name: column-gap-to-100;
    animation-duration: 2s;
    animation-delay: -1s;
    animation-play-state: paused;
  }
</style>
<body>
  <div id="multicol"></div>
  <div id="log"></div>

  <script>
    test(
      function(){
        var multicol = document.getElementById("multicol");
        assert_equals(getComputedStyle(multicol).columnGap, "100px");
      }, "Default column-gap is not interpolable");
  </script>
</body>