css/css-align/animation/column-gap-interpolation.html

<!DOCTYPE html>
<meta charset="UTF-8">
<title>column-gap interpolation</title>
<link rel="help" href="https://drafts.csswg.org/css-align-3/#propdef-column-gap">
<meta name="assert" content="column-gap supports animation by computed value type">

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

<style>
.parent {
  column-gap: 90px;
}
.target {
  column-count: 2;
  column-gap: 10px;
}
.expected div {
  opacity: 0.7;
}
.target > div {
  height: 20px;
  background-color: black;
}
.target.expected > div {
  background-color: green;
}
</style>

<body>
<template id='target-template'>
  <div></div><div></div>
</template>
</body>

<script>
test_interpolation({
  property: 'column-gap',
  from: neutralKeyframe,
  to: '40px',
}, [
  {at: -0.3, expect: '1px'},
  {at: 0, expect: '10px'},
  {at: 0.3, expect: '19px'},
  {at: 0.6, expect: '28px'},
  {at: 1, expect: '40px'},
  {at: 1.5, expect: '55px'},
]);

test_no_interpolation({
  property: 'column-gap',
  from: 'initial',
  to: '20px',
});

test_interpolation({
  property: 'column-gap',
  from: 'inherit',
  to: '20px',
}, [
  {at: -0.3, expect: '111px'},
  {at: 0, expect: '90px'},
  {at: 0.3, expect: '69px'},
  {at: 0.6, expect: '48px'},
  {at: 1, expect: '20px'},
  {at: 1.5, expect: '0px'},
]);

test_no_interpolation({
  property: 'column-gap',
  from: 'unset',
  to: '20px',
});

test_no_interpolation({
  property: 'column-gap',
  from: 'normal',
  to: '20px',
});

test_interpolation({
  property: 'column-gap',
  from: '0px',
  to: '100px'
}, [
  {at: -0.3, expect: '0'}, // column-gap can't be negative.
  {at: 0, expect: '0'},
  {at: 0.3, expect: '30px'},
  {at: 0.6, expect: '60px'},
  {at: 1, expect: '100px'},
  {at: 1.5, expect: '150px'}
]);
</script>