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

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

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

animation_test({
  syntax: "<color>",
  inherits: false,
  initialValue: "rgb(100, 100, 100)"
}, {
  composite: "add",
  keyframes: "rgb(150, 150, 150)",
  expected: "rgb(175, 175, 175)"
}, 'Animating a custom property of type <color> with a single keyframe and additivity');

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

</script>