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

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

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

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

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

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

</script>