<!DOCTYPE html>
<meta charset="UTF-8">
<title>border-image-width interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-backgrounds-3/#border-image-width">
<meta name="assert" content="border-image-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 {
  border-image-width: 100px;
}
.target {
  width: 80px;
  height: 80px;
  background-color: black;
  display: inline-block;
  border: 10px;
  border-image-source: linear-gradient(45deg, red, blue, green);
  border-image-width: 10px;
}
.expected {
  background-color: green;
  margin-right: 2px;
}
</style>

<body></body>

<script>
test_interpolation({
  property: 'border-image-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'},
  {at: 5,    expect:  '60px'},
  {at: 10,   expect: '110px'},
]);
test_no_interpolation({
  property: 'border-image-width',
  from: 'initial',
  to: '20px',
});
test_interpolation({
  property: 'border-image-width',
  from: 'inherit',
  to: '20px',
}, [
  {at: -0.3, expect: '124px'},
  {at: 0,    expect: '100px'},
  {at: 0.3,  expect:  '76px'},
  {at: 0.6,  expect:  '52px'},
  {at: 1,    expect:  '20px'},
  {at: 1.5,  expect:   '0px'},
  {at: 5,    expect:   '0px'},
  {at: 10,   expect:   '0px'},
]);
test_no_interpolation({
  property: 'border-image-width',
  from: 'unset',
  to: '20px',
});
test_interpolation({
  property: 'border-image-width',
  from: '0px',
  to: '20px'
}, [
  {at: -0.3, expect:   '0px'}, // CSS border-image-width can't be negative.
  {at: 0,    expect:   '0px'},
  {at: 0.3,  expect:   '6px'},
  {at: 0.6,  expect:  '12px'},
  {at: 1,    expect:  '20px'},
  {at: 1.5,  expect:  '30px'},
  {at: 5,    expect: '100px'},
  {at: 10,   expect: '200px'}
]);
test_interpolation({
  property: 'border-image-width',
  from: '0%',
  to: '20%'
}, [
  {at: -0.3, expect:   '0%'}, // CSS border-image-width can't be negative.
  {at: 0,    expect:   '0%'},
  {at: 0.3,  expect:   '6%'},
  {at: 0.6,  expect:  '12%'},
  {at: 1,    expect:  '20%'},
  {at: 1.5,  expect:  '30%'},
  {at: 5,    expect: '100%'},
  {at: 10,   expect: '200%'}
]);
test_interpolation({
  property: 'border-image-width',
  from: '0',
  to: '20'
}, [
  {at: -0.3, expect:   '0'}, // CSS border-image-width can't be negative.
  {at: 0,    expect:   '0'},
  {at: 0.3,  expect:   '6'},
  {at: 0.6,  expect:  '12'},
  {at: 1,    expect:  '20'},
  {at: 1.5,  expect:  '30'},
  {at: 5,    expect: '100'},
  {at: 10,   expect: '200'}
]);
test_interpolation({
  property: 'border-image-width',
  from: '10px 20% 30 40px',
  to: '80px 70% 60 50px'
}, [
  {at: -0.3, expect:   '0px   5%  21  37px'}, // CSS border-image-width can't be negative.
  {at: 0,    expect:  '10px  20%  30  40px'},
  {at: 0.3,  expect:  '31px  35%  39  43px'},
  {at: 0.6,  expect:  '52px  50%  48  46px'},
  {at: 1,    expect:  '80px  70%  60  50px'},
  {at: 1.5,  expect: '115px  95%  75  55px'},
  {at: 5,    expect: '360px 270% 180  90px'},
  {at: 10,   expect: '710px 520% 330 140px'}
]);
test_interpolation({
  property: 'border-image-width',
  from: '10%',
  to: '20px'
}, [
  // Percentages are relative to the size of the border image area, which is 120px.
  {at: -0.3, expect: 'calc(13% + -6px)'}, // Should be parsed as 16px - 6px = 10px
  {at: 0,    expect: '10%'},              // Should be parsed as 12px
  {at: 0.3,  expect: 'calc(7% + 6px)'},   // Should be parsed as 8px + 6px = 14px
  {at: 0.6,  expect: 'calc(4% + 12px)'},  // Should be parsed as 5px + 12px = 17px
  {at: 1,    expect: 'calc(0% + 20px)'},
  {at: 1.5,  expect: 'calc(-5% + 30px)'}, // Should be parsed as -6px + 30px = 24px
]);
test_interpolation({
  property: 'border-image-width',
  from: '10px',
  to: '20%'
}, [
  // Percentages are relative to the size of the border image area, which is 120px.
  {at: -0.3, expect: 'calc(13px + -6%)'}, // Should be parsed as 13px - 7px = 6px
  {at: 0,    expect: 'calc(0% + 10px)'},
  {at: 0.3,  expect: 'calc(7px + 6%)'},   // Should be parsed as 7px + 7px = 14px
  {at: 0.6,  expect: 'calc(4px + 12%)'},  // Should be parsed as 4px + 14px = 18px
  {at: 1,    expect: '20%'},              // Should be parsed as 24px
  {at: 1.5,  expect: 'calc(-5px + 30%)'}, // Should be parsed as -5px + 36px = 31px
]);

test_interpolation({
  property: 'border-image-width',
  from: '10px auto auto 20',
  to: '110px auto auto 120'
}, [
  {at: -0.3, expect: '  0px auto auto   0'},
  {at: 0,    expect: ' 10px auto auto  20'},
  {at: 0.3,  expect: ' 40px auto auto  50'},
  {at: 0.6,  expect: ' 70px auto auto  80'},
  {at: 1,    expect: '110px auto auto 120'},
  {at: 1.5,  expect: '160px auto auto 170'},
]);

test_no_interpolation({
  property: 'border-image-width',
  from: '10px auto auto 20',
  to: '110px auto 120 auto'
});
test_no_interpolation({
  property: 'border-image-width',
  from: '10px',
  to: '20'
});
test_no_interpolation({
  property: 'border-image-width',
  from: '10',
  to: '20px'
});
test_no_interpolation({
  property: 'border-image-width',
  from: '10%',
  to: '20'
});
test_no_interpolation({
  property: 'border-image-width',
  from: '10',
  to: '20%'
});
</script>
