<!DOCTYPE html>
<meta charset="UTF-8">
<title>outline-width interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-ui-3/#outline-width">
<meta name="assert" content="outline-width 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 {
  outline: solid transparent;
  outline-width: 30px;
}
.target {
  width: 50px;
  height: 50px;
  background-color: black;
  display: inline-block;
  margin: 18px;
  outline: solid orange;
  outline-width: 10px;
  opacity: 0.5;
}
.expected {
  background-color: green;
}
</style>

<body></body>

<script>
// NOTE: The below tests make assumptions about the values of medium (for unset
// and initial) and thick, namely that:
//   * medium=3px
//   * thick=3px
//
// A better version of these tests would dynamically generate the expected values
// by querying the computed style from the UA.

test_interpolation({
  property: 'outline-width',
  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: 'outline-width',
  from: 'initial',
  to: '23px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '3px'},
  {at: 0.3, expect: '9px'},
  {at: 0.6, expect: '15px'},
  {at: 1, expect: '23px'},
  {at: 1.5, expect: '33px'},
]);

test_interpolation({
  property: 'outline-width',
  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: 'outline-width',
  from: 'unset',
  to: '23px',
}, [
  {at: -0.3, expect: '0px'},
  {at: 0, expect: '3px'},
  {at: 0.3, expect: '9px'},
  {at: 0.6, expect: '15px'},
  {at: 1, expect: '23px'},
  {at: 1.5, expect: '33px'},
]);

test_interpolation({
  property: 'outline-width',
  from: '0px',
  to: '10px',
}, [
  {at: -0.3, expect: '0px'}, // CSS outline-width 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: 'outline-width',
  from: 'thick',
  to: '15px',
}, [
  {at: -2, expect: '0px'}, // CSS outline-width can't be negative.
  {at: -0.3, expect: '2px'},
  {at: 0, expect: '5px'},
  {at: 0.3, expect: '8px'},
  {at: 0.6, expect: '11px'},
  {at: 1, expect: '15px'},
  {at: 1.5, expect: '20px'}
]);
</script>
