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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-animation-percentage-space-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>