<!DOCTYPE html>
<meta charset="UTF-8">
<title>calc interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-values-3/#calc-notation">
<meta name="assert" content="calc supports animation by computed value">

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

<style>
.container {
  position: relative;
  width: 50px;
  height: 50px;
  border: black solid 2px;
  display: inline-block;
  margin-left: 10px;
  margin-right: 10px;
  background-color: white;
}
.target {
  position: absolute;
  width: 10px;
  height: 50px;
  background-color: black;
}
.expected {
  background-color: green;
}
</style>

<body>
<template id="target-template">
  <div class="container">
    <div class="target"></div>
  </div>
</template>
<div class="target" id="inf-target"></div>
<script>
const APPROX_INFINITY = (function() {
  const target = document.getElementById("inf-target");
  target.style.letterSpacing = "calc(1px * infinity)";
  const inf = parseFloat(getComputedStyle(target).letterSpacing);
  target.remove();
  return inf;
}());

test_interpolation({
  property: 'left',
  from: '0px',
  to: 'calc(infinity * 1px)',
  target_names:['CSS Transitions', 'CSS Transitions with transition: all']
}, [
  {at: -0.25, expect: `${APPROX_INFINITY * -0.25 }px`},
  {at: 0, expect: '0px'},
  {at: 0.25, expect: `${APPROX_INFINITY * 0.25}px`},
  {at: 0.5, expect: `${APPROX_INFINITY * 0.5}px`},
  {at: 0.75, expect: `${APPROX_INFINITY * 0.75}px`},
  {at: 1, expect: `${APPROX_INFINITY}px`},
  {at: 1.25, expect: `${APPROX_INFINITY * 1.25}px`}
]);

test_interpolation({
  property: 'left',
  from: '0px',
  to: 'calc(infinity * 1px)',
  target_names:['CSS Animations', 'Web Animations']
}, [
  {at: -0.25, expect: `${-APPROX_INFINITY}px`},
  {at: 0, expect: `0px`},
  {at: 0.25, expect: `${APPROX_INFINITY}px`},
  {at: 0.5, expect: `${APPROX_INFINITY}px`},
  {at: 0.75, expect: `${APPROX_INFINITY}px`},
  {at: 1, expect: `${APPROX_INFINITY}px`},
  {at: 1.25, expect: `${APPROX_INFINITY}px`}
]);

test_interpolation({
  property: 'left',
  from: 'calc(50% - 25px)',
  to: 'calc(100% - 10px)'
}, [
  {at: -0.25, expect: '-10px'},
  {at: 0, expect: '0px'},
  {at: 0.25, expect: '10px'},
  {at: 0.5, expect: '20px'},
  {at: 0.75, expect: '30px'},
  {at: 1, expect: '40px'},
  {at: 1.25, expect: '50px'}
]);

test_interpolation({
  property: 'text-indent',
  from: 'calc(50% - 25px)',
  to: 'calc(100% - 10px)'
}, [
  {at: -0.25, expect: 'calc(((50% - 25px) * 1.25) + ((100% - 10px) * -0.25))'},
  {at: 0, expect: 'calc(50% - 25px)'},
  {at: 0.25, expect: 'calc(((50% - 25px) * 0.75) + ((100% - 10px) * 0.25))'},
  {at: 0.5, expect: 'calc(((50% - 25px) * 0.5) + ((100% - 10px) * 0.5))'},
  {at: 0.75, expect: 'calc(((50% - 25px) * 0.25) + ((100% - 10px) * 0.75))'},
  {at: 1, expect: 'calc(100% - 10px)'},
  {at: 1.25, expect: 'calc(((50% - 25px) * -0.25) + ((100% - 10px) * 1.25))'}
]);

test_interpolation({
  property: 'text-indent',
  from: '0em',
  to: '100px'
}, [
  {at: -0.25, expect: '-25px'},
  {at: 0, expect: '0em'},
  {at: 0.25, expect: '25px'},
  {at: 0.5, expect: '50px'},
  {at: 0.75, expect: '75px'},
  {at: 1, expect: '100px'},
  {at: 1.25, expect: '125px'}
]);

test_interpolation({
  property: 'text-indent',
  from: '0%',
  to: '100px'
}, [
  {at: -0.25, expect: 'calc(0% + -25px)'},
  {at: 0, expect: '0%'},
  {at: 0.25, expect: 'calc(0% + 25px)'},
  {at: 0.5, expect: 'calc(0% + 50px)'},
  {at: 0.75, expect: 'calc(0% + 75px)'},
  {at: 1, expect: 'calc(0% + 100px)'},
  {at: 1.25, expect: 'calc(0% + 125px)'}
]);

</script>
</body>
