File: gap-decorations-010-crash.html

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<!DOCTYPE html>
<head>
    <title>Make sure we don't crash while attempting to animate.</title>
    <link rel="help" href="https://drafts.csswg.org/css-gaps-1/">
    <link rel="author" title="Javier Contreras" href="mailto:javiercon@microsoft.com">
</head>
<style>
    .crazy-class {
      height: 110px;
      width: 110px;
      display: flex;

      column-gap: 10px;

      column-rule-style: solid;
      column-rule-width: 1px; /* start at 1px */
    }

    .flex-item {
      width: 50px;
    }
  </style>
</head>
<body>
  <div class="crazy-class">
    <div class="flex-item"></div>
    <div class="flex-item"></div>
  </div>

  <script>
    window.addEventListener('load', () => {
      const container = document.querySelector('.crazy-class');

      // Animate row rule color from green → red
      container.animate(
        [
          { rowRuleColor: 'green' },
          { rowRuleColor: 'red' }
        ],
        {
          duration: 2000,
          easing: 'ease-out',
          fill: 'forwards'
        }
      );
    });
  </script>
</body>
</html>