File: keyframe-exceptions.html

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<!DOCTYPE html>
<head>
<meta charset="utf-8">
<link rel="help" src="https://www.w3.org/TR/web-animations-1/#processing-a-keyframes-argument">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/web-animations/testcommon.js"></script>
<script src="support/testcommon.js"></script>
<title>Keyframes with invalid offsets</title>
</head>
<script>
  test(() => {
    assert_throws_js(TypeError,
      function() {
        document.documentElement.animate([
          {offset: 0.6},
          {offset: 0.4}
        ]);
      });
  }, 'Offsets must be loosely sorted');

  test(() => {
      assert_throws_js(TypeError,
      function() {
        document.documentElement.animate([
          {offset: 'whatever'}
        ]);
      });
  }, 'Invalid offset');

  test(() => {
    assert_throws_js(TypeError,
      function() {
        document.documentElement.animate([
          {offset: -1}
        ]);
      });
  }, 'Offsets must be null or in the range [0,1]');
</script>