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chromium/third_party/blink/web_tests/external/wpt/css/css-properties-values-api/animation/custom-property-animation-transform-list-single-values.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: "<transform-list>",
  inherits: false,
  initialValue: "translateX(0px)"
}, {
  keyframes: ["translateX(100px)", "translateX(200px)"],
  expected: "translateX(150px)"
}, 'Animating a custom property of type <transform-list> containing a single value');

animation_test({
  syntax: "<transform-list>",
  inherits: false,
  initialValue: "translateX(100px)"
}, {
  keyframes: "translateX(200px)",
  expected: "translateX(150px)"
}, 'Animating a custom property of type <transform-list> containing a single value with a single keyframe');

animation_test({
  syntax: "<transform-list>",
  inherits: false,
  initialValue: "translateX(100px)"
}, {
  composite: "add",
  keyframes: ["translateX(200px)", "translateX(300px)"],
  expected: "translateX(100px) translateX(250px)"
}, 'Animating a custom property of type <transform-list> containing a single value with additivity');

animation_test({
  syntax: "<transform-list>",
  inherits: false,
  initialValue: "translateX(100px)"
}, {
  composite: "add",
  keyframes: "translateX(300px)",
  expected: "translateX(100px) translateX(150px)"
}, 'Animating a custom property of type <transform-list> containing a single value with a single keyframe and additivity');

animation_test({
  syntax: "<transform-list>",
  inherits: false,
  initialValue: "translateX(100px)"
}, {
  iterationComposite: "accumulate",
  keyframes: ["translateX(0px)", "translateX(100px)"],
  expected: "translateX(250px)"
}, 'Animating a custom property of type <transform-list> containing a single value with iterationComposite');

</script>