<!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: "<time>+",
  inherits: false,
  initialValue: "0s"
}, {
  keyframes: ["100s 150s", "200s 250s"],
  expected: "150s 200s"
}, 'Animating a custom property of type <time>+');

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

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

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

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

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

</script>
