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chromium/third_party/blink/web_tests/external/wpt/css/css-animations/display-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 alwaysBlock = [
  {at: -1, expect: 'block'},
  {at: 0, expect: 'block'},
  {at: 0.1, expect: 'block'},
  {at: 0.9, expect: 'block'},
  {at: 1, expect: 'block'},
  {at: 1.5, expect: 'block'},
];
const alwaysNone = [
  {at: -1, expect: 'none'},
  {at: 0, expect: 'none'},
  {at: 0.1, expect: 'none'},
  {at: 0.9, expect: 'none'},
  {at: 1, expect: 'none'},
  {at: 1.5, expect: 'none'},
];

test_interpolation({
  property: 'display',
  behavior: 'allow-discrete',
  from: 'block',
  to: 'none',
}, [
  {at: -1, expect: 'block'},
  {at: 0, expect: 'block'},
  {at: 0.1, expect: 'block'},
  {at: 0.9, expect: 'block'},
  {at: 1, expect: 'none'},
  {at: 1.5, expect: 'none'},
]);

// This transitions test expect 'block' at every point because transitioning
// from display:none does not provide an initial style. This is expected and
// can be worked around by using @initial.
test_interpolation({
  property: 'display',
  behavior: 'allow-discrete',
  from: 'none',
  to: 'block',
  'CSS Transitions with transition: all': alwaysBlock,
  'CSS Transitions': alwaysBlock
}, [
  {at: -1, expect: 'none'},
  {at: 0, expect: 'none'},
  {at: 0.1, expect: 'block'},
  {at: 0.9, expect: 'block'},
  {at: 1, expect: 'block'},
  {at: 1.5, expect: 'block'},
]);

test_no_interpolation({
  property: 'display',
  from: 'inline',
  to: 'block'
});

test_interpolation({
  property: 'display',
  behavior: 'allow-discrete',
  from: 'block',
  to: 'block'
}, alwaysBlock);

test_interpolation({
  property: 'display',
  behavior: 'allow-discrete',
  from: 'none',
  to: 'none'
}, alwaysNone);
</script>