percentage-type-interpolation.html | Explore in Territory

<!DOCTYPE html>
<meta charset="UTF-8">
<style>
.parent {
  --percentage: 30%;
}
.target {
  --percentage: 10%;
}
</style>
<body>
<script src="../interpolation/resources/interpolation-test.js"></script>
<script>
CSS.registerProperty({
  name: '--percentage',
  syntax: '<percentage>',
  initialValue: '40%',
  inherits: false,
});

assertInterpolation({
  property: '--percentage',
  from: neutralKeyframe,
  to: '20%',
}, [
  {at: -0.3, is: '7%'},
  {at: 0, is: '10%'},
  {at: 0.5, is: '15%'},
  {at: 1, is: '20%'},
  {at: 1.5, is: '25%'},
]);

assertInterpolation({
  property: '--percentage',
  from: 'initial',
  to: '20%',
}, [
  {at: -0.3, is: '46%'},
  {at: 0, is: '40%'},
  {at: 0.5, is: '30%'},
  {at: 1, is: '20%'},
  {at: 1.5, is: '10%'},
]);

assertInterpolation({
  property: '--percentage',
  from: 'inherit',
  to: '20%',
}, [
  {at: -0.3, is: '33%'},
  {at: 0, is: '30%'},
  {at: 0.5, is: '25%'},
  {at: 1, is: '20%'},
  {at: 1.5, is: '15%'},
]);

assertInterpolation({
  property: '--percentage',
  from: 'unset',
  to: '20%',
}, [
  {at: -0.3, is: '46%'},
  {at: 0, is: '40%'},
  {at: 0.5, is: '30%'},
  {at: 1, is: '20%'},
  {at: 1.5, is: '10%'},
]);

assertInterpolation({
  property: '--percentage',
  from: '-10%',
  to: '10%',
}, [
  {at: -0.3, is: '-16%'},
  {at: 0, is: '-10%'},
  {at: 0.5, is: '0%'},
  {at: 1, is: '10%'},
  {at: 1.5, is: '20%'},
]);
</script>
</body>

chromium/third_party/blink/web_tests/animations/custom-properties/percentage-type-interpolation.html