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chromium/third_party/blink/web_tests/external/wpt/css/css-values/calc-size/animation/interpolate-size-logical-properties-interpolation.html 

<!DOCTYPE html>
<meta charset="UTF-8">
<title>max-height interpolation with interpolate-size: allow-keywords</title>
<link rel="help" href="https://drafts.csswg.org/css-sizing-3/#propdef-max-height">
<link rel="help" href="https://drafts.csswg.org/css-values-5/#interpolate-size">

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

<style>
:root {
  interpolate-size: allow-keywords;
}
.parent {
  height: 200px;
  max-height: 300px;
}
.target {
  width: 100px;
  height: 50px;
  max-height: 100px;
}
.target::before {
  display: block;
  content: "";
  width: 125px;
  height: 75px;
}

</style>

<body>
<template id="target-template">
  <div>
    <div class="target"></div>
  </div>
</template>
</body>

<script>

test_interpolation({
  property: 'block-size',
  from: 'max-content', /* 75px */
  to: '25px',
}, [
  {at: -0.3, expect: '90px'},
  {at: 0, expect: '75px'},
  {at: 0.3, expect: '60px'},
  {at: 0.6, expect: '45px'},
  {at: 1, expect: '25px'},
  {at: 1.5, expect: '0px'}
]);

test_interpolation({
  property: 'inline-size',
  from: 'max-content', /* 125px */
  to: neutralKeyframe, /* 100px */
}, [
  {at: -0.3, expect: '132.5px'},
  {at: 0, expect: '125px'},
  {at: 0.3, expect: '117.5px'},
  {at: 0.6, expect: '110px'},
  {at: 1, expect: '100px'},
  {at: 1.5, expect: '87.5px'}
]);

test_interpolation({
  property: 'max-block-size',
  from: neutralKeyframe, /* 100px */
  to: 'fit-content',
}, [
  {at: -0.3, expect: 'calc-size(fit-content, 130px + size * -0.3)'},
  {at: 0, expect: 'calc-size(fit-content, 100px + size * 0)'},
  {at: 0.3, expect: 'calc-size(fit-content, 70px + size * 0.3)'},
  {at: 0.6, expect: 'calc-size(fit-content, 40px + size * 0.6)'},
  {at: 1, expect: 'calc-size(fit-content, 0px + size * 1)'},
  {at: 1.5, expect: 'calc-size(fit-content, -50px + size * 1.5)'}
]);

test_interpolation({
  property: 'max-inline-size',
  from: 'max-content',
  to: '100px',
}, [
  {at: -0.3, expect: 'calc-size(max-content, -30px + size * 1.3)'},
  {at: 0, expect: 'calc-size(max-content, 0px + size * 1)'},
  {at: 0.3, expect: 'calc-size(max-content, 30px + size * 0.7)'},
  {at: 0.6, expect: 'calc-size(max-content, 60px + size * 0.4)'},
  {at: 1, expect: 'calc-size(max-content, 100px + size * 0)'},
  {at: 1.5, expect: 'calc-size(max-content, 150px + size * -0.5)'}
]);

test_interpolation({
  property: 'min-block-size',
  from: '200px',
  to: 'min-content',
}, [
  {at: -0.3, expect: 'calc-size(min-content, 260px + size * -0.3)'},
  {at: 0, expect: 'calc-size(min-content, 200px + size * 0)'},
  {at: 0.3, expect: 'calc-size(min-content, 140px + size * 0.3)'},
  {at: 0.6, expect: 'calc-size(min-content, 80px + size * 0.6)'},
  {at: 1, expect: 'calc-size(min-content, 0px + size * 1)'},
  {at: 1.5, expect: 'calc-size(min-content, -100px + size * 1.5)'}
]);

test_interpolation({
  property: 'min-inline-size',
  from: neutralKeyframe, /* auto */
  to: '100px',
}, [
  {at: -0.3, expect: 'calc-size(auto, -30px + size * 1.3)'},
  {at: 0, expect: 'calc-size(auto, 0px + size * 1)'},
  {at: 0.3, expect: 'calc-size(auto, 30px + size * 0.7)'},
  {at: 0.6, expect: 'calc-size(auto, 60px + size * 0.4)'},
  {at: 1, expect: 'calc-size(auto, 100px + size * 0)'},
  {at: 1.5, expect: 'calc-size(auto, 150px + size * -0.5)'}
]);

</script>