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

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

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

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

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

discrete_animation_test("<angle>+", '10deg 20deg', '30deg', 'Animating a custom property of type <angle>+ with different lengths is discrete');

</script>