wpt/css/css-values/attr-security-animation.html at master · web-platform-tests/wpt · GitHub

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<!DOCTYPE html>
<title>CSS Values and Units Test: attr() security limitations</title>
<link rel="help" href="https://drafts.csswg.org/css-values-5/#attr-security">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>

<style>
  @property --s {
    syntax: "<string>";
    inherits: false;
    initial-value: "x";
  }
  #attr {
    --s: attr(href);
    animation: 1s anim linear;
    background-image: image-set(var(--s));
  }

  @keyframes anim {
    from {
      --s: "x";
    }
    to {
      --s: attr(href);
    }
  }
</style>

<html>
  <body>
    <div id="attr" href="https://does-not-exist.test/404.png">div</div>
  </body>
</html>

<script>
  test(() => {
    // during animation
    document.getAnimations().forEach(anim => {
      anim.currentTime = 600;
    });
    var elem = document.getElementById("attr");
    assert_equals(window.getComputedStyle(elem).getPropertyValue("background-image"), 'none');

    // after animation
    document.getAnimations().forEach(anim => {
      anim.currentTime = 3000;
    });
    var elem = document.getElementById("attr");
    assert_equals(window.getComputedStyle(elem).getPropertyValue("background-image"), 'none');
  });
</script>