<!DOCTYPE html>
<meta charset="UTF-8">
<title>font-variation-settings composition</title>
<link rel="help" href="https://drafts.csswg.org/css-fonts-4/#propdef-font-variation-settings">
<meta name="assert" content="font-variation-settings supports animation pairwise by 'like' properties">

<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<body></body>

<script>
function compareVariationSettings(actual, expected) {
  // The order of <axis, value> pairs in the variation-settings list is arbitrary,
  // so we sort the pairs before attempting to compare. (We only need to use this
  // when multiple settings are expected, otherwise the default comparison is OK.)
  assert_equals(normalizeValue(actual).split(", ").sort().join(", "),
                normalizeValue(expected).split(", ").sort().join(", "));
};

test_composition({
  property: 'font-variation-settings',
  underlying: "'test' 50",
  addFrom: "'test' 100",
  addTo: "'test' 200",
}, [
  {at: -0.3, expect: "'test' 120"},
  {at: 0, expect: "'test' 150"},
  {at: 0.5, expect: "'test' 200"},
  {at: 1, expect: "'test' 250"},
  {at: 1.5, expect: "'test' 300"},
]);

test_composition({
  property: 'font-variation-settings',
  underlying: "'test' 50",
  addFrom: "'test' 100",
  replaceTo: "'test' 200",
}, [
  {at: -0.3, expect: "'test' 135"},
  {at: 0, expect: "'test' 150"},
  {at: 0.5, expect: "'test' 175"},
  {at: 1, expect: "'test' 200"},
  {at: 1.5, expect: "'test' 225"},
]);

test_composition({
  property: 'font-variation-settings',
  underlying: "'test' 100",
  addFrom: 'normal',
  replaceTo: "'test' 200",
}, [
  {at: -0.3, expect: 'normal'},
  {at: 0, expect: 'normal'},
  {at: 0.5, expect: "'test' 200"},
  {at: 1, expect: "'test' 200"},
  {at: 1.5, expect: "'test' 200"},
]);

test_composition({
  property: 'font-variation-settings',
  underlying: "'test' 100",
  addFrom: 'normal',
  addTo: "'test' 200",
}, [
  {at: -0.3, expect: 'normal'},
  {at: 0, expect: 'normal'},
  {at: 0.5, expect: "'test' 300"},
  {at: 1, expect: "'test' 300"},
  {at: 1.5, expect: "'test' 300"},
]);

test_composition({
  property: 'font-variation-settings',
  underlying: "'aaaa' 100, 'bbbb' 200",
  addFrom: "'aaaa' 20, 'bbbb' 50",
  addTo: "'aaaa' 30, 'bbbb' 100",
  comparisonFunction: compareVariationSettings,
}, [
  {at: -0.3, expect: "'aaaa' 117, 'bbbb' 235"},
  {at: 0, expect: "'aaaa' 120, 'bbbb' 250"},
  {at: 0.5, expect: "'aaaa' 125, 'bbbb' 275"},
  {at: 1, expect: "'aaaa' 130, 'bbbb' 300"},
  {at: 1.5, expect: "'aaaa' 135, 'bbbb' 325"},
]);

test_composition({
  property: 'font-variation-settings',
  underlying: "'test' 100",
  addFrom: "'aaaa' 20, 'bbbb' 50",
  addTo: "'aaaa' 30, 'bbbb' 100",
  comparisonFunction: compareVariationSettings,
}, [
  {at: -0.3, expect: "'aaaa' 17, 'bbbb' 35"},
  {at: 0, expect: "'aaaa' 20, 'bbbb' 50"},
  {at: 0.5, expect: "'aaaa' 25, 'bbbb' 75"},
  {at: 1, expect: "'aaaa' 30, 'bbbb' 100"},
  {at: 1.5, expect: "'aaaa' 35, 'bbbb' 125"},
]);
</script>
</body>
