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chromium/third_party/blink/web_tests/external/wpt/css/css-text/animations/text-indent-composition.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<title>letter-spacing composition</title>
<link rel="help" href="https://drafts.csswg.org/css-text-3/#text-indent-property">
<meta name="test" content="text-indent supports animation by computed value type">

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

<body></body>
<script>
test_composition({
  property: 'text-indent',
  underlying: '100%',
  addFrom: '50px',
  addTo: '150px',
}, [
  {at: -0.3, expect: 'calc(100% + 20px)'},
  {at: 0, expect: 'calc(100% + 50px)'},
  {at: 0.3, expect: 'calc(100% + 80px)'},
  {at: 0.6, expect: 'calc(100% + 110px)'},
  {at: 1, expect: 'calc(100% + 150px)'},
  {at: 1.5, expect: 'calc(100% + 200px)'},
]);

test_composition({
  property: 'text-indent',
  underlying: '250px',
  addFrom: '50px',
  replaceTo: '100px',
}, [
  {at: -0.3, expect: '360px'},
  {at: 0, expect: '300px'},
  {at: 0.3, expect: '240px'},
  {at: 0.6, expect: '180px'},
  {at: 1, expect: '100px'},
  {at: 1.5, expect: '0px'},
]);

test_composition({
  property: 'text-indent',
  underlying: '50%',
  replaceFrom: '-100%',
  addTo: '50%',
}, [
  {at: -0.3, expect: '-160%'},
  {at: 0, expect: '-100%'},
  {at: 0.3, expect: '-40%'},
  {at: 0.5, expect: '0%'},
  {at: 0.6, expect: '20%'},
  {at: 1, expect: '100%'},
  {at: 1.5, expect: '200%'},
]);

test_composition({
  property: 'text-indent',
  underlying: '250px',
  addFrom: '50px each-line hanging',
  replaceTo: '150px hanging each-line',
}, [
  {at: -0.3, expect: '20px hanging each-line'},
  {at: 0, expect: '50px hanging each-line'},
  {at: 0.3, expect: '80px hanging each-line'},
  {at: 0.6, expect: '110px hanging each-line'},
  {at: 1, expect: '150px hanging each-line'},
  {at: 1.5, expect: '200px hanging each-line'},
]);

test_composition({
  property: 'text-indent',
  underlying: '250px each-line',
  addFrom: '50px each-line',
  replaceTo: '150px hanging',
}, [
  {at: -0.3, expect: '300px each-line'},
  {at: 0, expect: '300px each-line'},
  {at: 0.3, expect: '300px each-line'},
  {at: 0.6, expect: '150px hanging'},
  {at: 1, expect: '150px hanging'},
  {at: 1.5, expect: '150px hanging'},
]);
</script>
</body>