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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-animation-length.html 

<!DOCTYPE html>
<link rel="help" href="https://drafts.css-houdini.org/css-properties-values-api-1">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="../resources/utils.js"></script>
<div id="target"></div>
<script>

animation_test({
  syntax: "<length>",
  inherits: false,
  initialValue: "0px"
}, {
  keyframes: ["100px", "200px"],
  expected: "150px"
}, 'Animating a custom property of type <length>');

animation_test({
  syntax: "<length>",
  inherits: false,
  initialValue: "100px"
}, {
  keyframes: "200px",
  expected: "150px"
}, 'Animating a custom property of type <length> with a single keyframe');

animation_test({
  syntax: "<length>",
  inherits: false,
  initialValue: "100px"
}, {
  composite: "add",
  keyframes: ["200px", "300px"],
  expected: "350px"
}, 'Animating a custom property of type <length> with additivity');

animation_test({
  syntax: "<length>",
  inherits: false,
  initialValue: "100px"
}, {
  composite: "add",
  keyframes: "300px",
  expected: "250px"
}, 'Animating a custom property of type <length> with a single keyframe and additivity');

animation_test({
  syntax: "<length>",
  inherits: false,
  initialValue: "100px"
}, {
  iterationComposite: "accumulate",
  keyframes: ["0px", "100px"],
  expected: "250px"
}, 'Animating a custom property of type <length> with iterationComposite');

</script>