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<!DOCTYPE html>
<meta charset="UTF-8">
<title>padding interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-box-3/#padding-shorthand">
<meta name="assert" content="padding supports animation as a list of lengths">

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

<style>
.parent {
  padding: 30px;
}
.target {
  width: 1px;
  height: 1px;
  background-color: black;
  display: inline-block;
  padding: 10px;
}
.expected {
  background-color: green;
  margin-right: 10px;
}
</style>

<body></body>

<script>
test_interpolation({
  property: 'padding',
  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: 'padding',
  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: 'padding',
  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: 'padding',
  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: 'padding',
  from: '0px',
  to: '10px'
}, [
  {at: -0.3, expect: '0px'}, // CSS padding can't be negative.
  {at: 0, expect: '0px'},
  {at: 0.3, expect: '3px'},
  {at: 0.6, expect: '6px'},
  {at: 1, expect: '10px'},
  {at: 1.5, expect: '15px'}
]);

test_interpolation({
  property: 'padding',
  from: '20px 40px 60px 80px',
  to: '30px 50px 70px 90px'
}, [
  {at: -0.3, expect: '17px 37px 57px 77px'},
  {at: 0, expect: '20px 40px 60px 80px'},
  {at: 0.3, expect: '23px 43px 63px 83px'},
  {at: 0.6, expect: '26px 46px 66px 86px'},
  {at: 1, expect: '30px 50px 70px 90px'},
  {at: 1.5, expect: '35px 55px 75px 95px'}
]);
</script>