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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-animation-percentage-comma-list.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: "<percentage>#",
  inherits: false,
  initialValue: "0%"
}, {
  keyframes: ["100%, 150%", "200%, 250%"],
  expected: "150%, 200%"
}, 'Animating a custom property of type <percentage>#');

animation_test({
  syntax: "<percentage>#",
  inherits: false,
  initialValue: "100%, 150%"
}, {
  keyframes: "200%, 250%",
  expected: "150%, 200%"
}, 'Animating a custom property of type <percentage># with a single keyframe');

animation_test({
  syntax: "<percentage>#",
  inherits: false,
  initialValue: "50%, 100%"
}, {
  composite: "add",
  keyframes: ["150%, 200%", "250%, 300%"],
  expected: "250%, 350%"
}, 'Animating a custom property of type <percentage># with additivity');

animation_test({
  syntax: "<percentage>#",
  inherits: false,
  initialValue: "50%, 100%"
}, {
  composite: "add",
  keyframes: "150%, 200%",
  expected: "125%, 200%"
}, 'Animating a custom property of type <percentage># with a single keyframe and additivity');

animation_test({
  syntax: "<percentage>#",
  inherits: false,
  initialValue: "0%, 0%"
}, {
  iterationComposite: "accumulate",
  keyframes: ["0%, 50%", "100%, 100%"],
  expected: "250%, 275%"
}, 'Animating a custom property of type <percentage># with iterationComposite');

discrete_animation_test("<percentage>#", '10%, 20%', '30%', 'Animating a custom property of type <percentage># with different lengths is discrete');

</script>