<!DOCTYPE html>
<meta charset="UTF-8">
<title>mask-border-slice interpolation</title>
<link rel="help" href="https://drafts.fxtf.org/css-masking/#propdef-mask-border-slice">
<link rel="author" title="Tim Nguyen" href="https://github.com/nt1m">
<meta name="assert" content="mask-border-slice 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 {
  mask-border-slice: 50%;
}
.target {
  width: 50px;
  height: 50px;
  background-color: black;
  display: inline-block;
  border: 25px;
  mask-border-source: linear-gradient(45deg, red, blue, green);
  mask-border-slice: 20%;
}
.expected {
  background-color: green;
  margin-right: 2px;
}
</style>

<body></body>

<script>
test_interpolation({
  property: 'mask-border-slice',
  from: neutralKeyframe,
  to: '10%',
}, [
  {at: -0.3, expect: '23%'},
  {at: 0, expect: '20%'},
  {at: 0.3, expect: '17%'},
  {at: 0.5, expect: '15%'},
  {at: 0.6, expect: '14%'},
  {at: 1, expect: '10%'},
  {at: 1.5, expect: '5%'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: 'initial',
  to: '10',
}, [
  {at: -0.3, expect: '0'},
  {at: 0, expect: '0'},
  {at: 0.3, expect: '3'},
  {at: 0.5, expect: '5'},
  {at: 0.6, expect: '6'},
  {at: 1, expect: '10'},
  {at: 1.5, expect: '15'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: 'inherit',
  to: '10%',
}, [
  {at: -0.3, expect: '62%'},
  {at: 0, expect: '50%'},
  {at: 0.3, expect: '38%'},
  {at: 0.5, expect: '30%'},
  {at: 0.6, expect: '26%'},
  {at: 1, expect: '10%'},
  {at: 1.5, expect: '0%'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: 'unset',
  to: '10',
}, [
  {at: -0.3, expect: '0'},
  {at: 0, expect: '0'},
  {at: 0.3, expect: '3'},
  {at: 0.5, expect: '5'},
  {at: 0.6, expect: '6'},
  {at: 1, expect: '10'},
  {at: 1.5, expect: '15'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: '0%',
  to: '50%',
}, [
  {at: -0.3, expect: '0%'}, // CSS mask-border-slice can't be negative.
  {at: 0, expect: '0%'},
  {at: 0.3, expect: '15%'},
  {at: 0.5, expect: '25%'},
  {at: 0.6, expect: '30%'},
  {at: 1, expect: '50%'},
  {at: 1.5, expect: '75%'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: '0% 10% 20% 30%',
  to: '40% 50% 60% 70%',
}, [
  {at: -0.5, expect: '0% 0% 0% 10%'},
  {at: 0, expect: '0% 10% 20% 30%'},
  {at: 0.3, expect: '12% 22% 32% 42%'},
  {at: 0.5, expect: '20% 30% 40% 50%'},
  {at: 0.6, expect: '24% 34% 44% 54%'},
  {at: 1, expect: '40% 50% 60% 70%'},
  {at: 1.5, expect: '60% 70% 80% 90%'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: '0 10 20 30 fill',
  to: '40 50 60 70 fill',
}, [
  {at: -0.5, expect: '0 0 0 10 fill'}, // CSS mask-border-slice can't be negative.
  {at: 0, expect: '0 10 20 30 fill'},
  {at: 0.3, expect: '12 22 32 42 fill'},
  {at: 0.5, expect: '20 30 40 50 fill'},
  {at: 0.6, expect: '24 34 44 54 fill'},
  {at: 1, expect: '40 50 60 70 fill'},
  {at: 1.5, expect: '60 70 80 90 fill'},
]);

test_interpolation({
  property: 'mask-border-slice',
  from: '0% 10 20% 30 fill',
  to: '40% 50 60% 70 fill',
}, [
  {at: -0.5, expect: '0% 0 0% 10 fill'}, // CSS mask-border-slice can't be negative.
  {at: 0, expect: '0% 10 20% 30 fill'},
  {at: 0.3, expect: '12% 22 32% 42 fill'},
  {at: 0.5, expect: '20% 30 40% 50 fill'},
  {at: 0.6, expect: '24% 34 44% 54 fill'},
  {at: 1, expect: '40% 50 60% 70 fill'},
  {at: 1.5, expect: '60% 70 80% 90 fill'},
]);

test_no_interpolation({
  property: 'mask-border-slice',
  from: '0% fill',
  to: '50%',
});

test_no_interpolation({
  property: 'mask-border-slice',
  from: '50%',
  to: '100',
});

test_no_interpolation({
  property: 'mask-border-slice',
  from: '50% fill',
  to: '100 fill',
});

test_no_interpolation({
  property: 'mask-border-slice',
  from: '0% 10 20% 30 fill',
  to: '40% 50 60% 70',
});

test_no_interpolation({
  property: 'mask-border-slice',
  from: '0% 10 20 30 fill',
  to: '40 50 60% 70',
});
</script>
</body>