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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-animation-length-percentage.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-percentage>",
  inherits: false,
  initialValue: "0px"
}, {
  keyframes: ["100px", "100%"],
  expected: "calc(50% + 50px)"
}, 'Animating a custom property of type <length-percentage>');

animation_test({
  syntax: "<length-percentage>",
  inherits: false,
  initialValue: "100px"
}, {
  keyframes: "100%",
  expected: "calc(50% + 50px)"
}, 'Animating a custom property of type <length-percentage> with a single keyframe');

animation_test({
  syntax: "<length-percentage>",
  inherits: false,
  initialValue: "100px"
}, {
  composite: "add",
  keyframes: ["200%", "300%"],
  expected: "calc(250% + 100px)"
}, 'Animating a custom property of type <length-percentage> with additivity');

animation_test({
  syntax: "<length-percentage>",
  inherits: false,
  initialValue: "100px"
}, {
  composite: "add",
  keyframes: "300%",
  expected: "calc(150% + 100px)"
}, 'Animating a custom property of type <length-percentage> with a single keyframe and additivity');

animation_test({
  syntax: "<length-percentage>",
  inherits: false,
  initialValue: "100px"
}, {
  iterationComposite: "accumulate",
  keyframes: ["50px", "100%"],
  expected: "calc(250% + 25px)"
}, 'Animating a custom property of type <length-percentage> with iterationComposite');

</script>