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chromium/third_party/blink/web_tests/external/wpt/css/css-contain/content-visibility/content-visibility-interpolation.html 

<!DOCTYPE html>
<link rel=author href="mailto:[email protected]">
<link rel=help href="https://github.com/w3c/csswg-drafts/issues/6429">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<body>
<script>
const alwaysVisible = [
  {at: -1, expect: 'visible'},
  {at: 0, expect: 'visible'},
  {at: 0.1, expect: 'visible'},
  {at: 0.9, expect: 'visible'},
  {at: 1, expect: 'visible'},
  {at: 1.5, expect: 'visible'},
];
const alwaysHidden = [
  {at: -1, expect: 'hidden'},
  {at: 0, expect: 'hidden'},
  {at: 0.1, expect: 'hidden'},
  {at: 0.9, expect: 'hidden'},
  {at: 1, expect: 'hidden'},
  {at: 1.5, expect: 'hidden'},
];

test_interpolation({
  property: 'content-visibility',
  behavior: 'allow-discrete',
  from: 'visible',
  to: 'hidden',
}, [
  {at: -1, expect: 'visible'},
  {at: 0, expect: 'visible'},
  {at: 0.1, expect: 'visible'},
  {at: 0.9, expect: 'visible'},
  {at: 1, expect: 'hidden'},
  {at: 1.5, expect: 'hidden'},
]);

test_interpolation({
  property: 'content-visibility',
  behavior: 'allow-discrete',
  from: 'hidden',
  to: 'visible',
}, [
  {at: -1, expect: 'hidden'},
  {at: 0, expect: 'hidden'},
  {at: 0.1, expect: 'visible'},
  {at: 0.9, expect: 'visible'},
  {at: 1, expect: 'visible'},
  {at: 1.5, expect: 'visible'},
]);

test_no_interpolation({
  property: 'content-visibility',
  from: 'auto',
  to: 'visible'
});

test_interpolation({
  property: 'content-visibility',
  from: 'visible',
  to: 'visible'
}, [
  {at: -1, expect: 'visible'},
  {at: 0, expect: 'visible'},
  {at: 0.5, expect: 'visible'},
  {at: 1, expect: 'visible'},
  {at: 1.5, expect: 'visible'},
]);

test_interpolation({
  property: 'content-visibility',
  from: 'hidden',
  to: 'hidden'
}, [
  {at: -1, expect: 'hidden'},
  {at: 0, expect: 'hidden'},
  {at: 0.5, expect: 'hidden'},
  {at: 1, expect: 'hidden'},
  {at: 1.5, expect: 'hidden'},
]);
</script>