<!DOCTYPE html>
<meta charset="UTF-8">
<title>border-radius interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-radius">
<meta name="assert" content="border-radius 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>
.parent {
  border-radius: 30px;
}
.target {
  width: 80px;
  height: 80px;
  display: inline-block;
  background-color: black;
  margin-right: 5px;
  border-radius: 10px;
}
.expected {
  background-color: green;
  margin-right: 15px;
}
</style>

<body></body>

<script>
// As per https://bugzilla.mozilla.org/show_bug.cgi?id=137688, Firefox does not
// support getComputedStyle for shorthands. As such, we have one test for this
// which explicitly checks the shorthand variant, but most tests use one of the
// longhands instead.
function compareNotEmpty(actual, expected) {
  assert_equals(actual, expected);
  assert_not_equals(actual, '');
}

test_interpolation({
  property: 'border-radius',
  from: '20px 40px 60px 80px / 120px 140px 160px 180px',
  to: '30px 50px 70px 90px / 130px 150px 170px 190px',
  comparisonFunction: compareNotEmpty,
}, [
  {at: -0.3, expect: '17px 37px 57px 77px / 117px 137px 157px 177px'},
  {at: 0, expect: '20px 40px 60px 80px / 120px 140px 160px 180px'},
  {at: 0.3, expect: '23px 43px 63px 83px / 123px 143px 163px 183px'},
  {at: 0.6, expect: '26px 46px 66px 86px / 126px 146px 166px 186px'},
  {at: 1, expect: '30px 50px 70px 90px / 130px 150px 170px 190px'},
  {at: 1.5, expect: '35px 55px 75px 95px / 135px 155px 175px 195px'}
]);

test_interpolation({
  property: 'border-top-left-radius',
  from: neutralKeyframe,
  to: '20px',
}, [
  {at: -0.3, expect: '7px'},
  {at: 0, expect: '10px'},
  {at: 0.3, expect: '13px'},
  {at: 0.6, expect: '16px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '25px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'initial',
  to: '20px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '0px'},
  {at: 0.3, expect: '6px'},
  {at: 0.6, expect: '12px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '30px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'inherit',
  to: '20px',
}, [
  {at: -0.3, expect: '33px'},
  {at: 0, expect: '30px'},
  {at: 0.3, expect: '27px'},
  {at: 0.6, expect: '24px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '15px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: 'unset',
  to: '20px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '0px'},
  {at: 0.3, expect: '6px'},
  {at: 0.6, expect: '12px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '30px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: '10px',
  to: '50px'
}, [
  {at: -0.3, expect: '0px'}, // CSS border-top-left-radius can't be negative.
  {at: 0, expect: '10px'},
  {at: 0.3, expect: '22px'},
  {at: 0.6, expect: '34px'},
  {at: 1, expect: '50px'},
  {at: 1.5, expect: '70px'},
]);
test_interpolation({
  property: 'border-top-left-radius',
  from: '10px',
  to: '100%'
}, [
  {at: -0.3, expect: 'calc(13px + -30%)'},
  {at: 0, expect: 'calc(10px + 0%)'},
  {at: 0.3, expect: 'calc(7px + 30%)'},
  {at: 0.6, expect: 'calc(4px + 60%)'},
  {at: 1, expect: '100%'},
  {at: 1.5, expect: 'calc(-5px + 150%)'},
]);

test_interpolation({
  property: 'border-top-left-radius',
  from: '20px',
  to: '10px 30px'
}, [
  {at: -2, expect: '40px 0px'},
  {at: -0.3, expect: '23px 17px'},
  {at: 0, expect: '20px'},
  {at: 0.3, expect: '17px 23px'},
  {at: 0.6, expect: '14px 26px'},
  {at: 1, expect: '10px 30px'},
  {at: 1.5, expect: '5px 35px'}
]);
</script>