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chromium/third_party/blink/web_tests/external/wpt/html/semantics/popovers/popover-css-properties.tentative.html 

<!DOCTYPE html>
<meta charset="utf-8">
<title>Popover API CSS parsing with computed values</title>
<link rel="author" href="mailto:[email protected]">
<link rel=help href="https://open-ui.org/components/popover.research.explainer">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/parsing-testcommon.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<script src="/css/support/interpolation-testcommon.js"></script>

<div id=target></div>
<div id=scratch></div>

<script>
function testprop(prop) {
  // Computed values:
  test_computed_value(prop, '0s');
  test_computed_value(prop, '0ms', '0s');
  test_computed_value(prop, '32s');
  test_computed_value(prop, '123ms', '0.123s');

  // Valid values:
  test_valid_value(prop, '0s');
  test_valid_value(prop, '0ms');
  test_valid_value(prop, '32s');
  test_valid_value(prop, '123ms');
  test_valid_value(prop, 'inherit');

  // Invalid values:
  test_invalid_value(prop, '0');
  test_invalid_value(prop, 'foo');
  test_invalid_value(prop, '-1s');
  test_invalid_value(prop, 'none');
  test_invalid_value(prop, 'auto');

  // Animations:
  test_interpolation({
    property: prop,
    from: '1s',
    to: '2000ms',
  }, [
    {at: -1.5, expect: '0s'}, // Clamping at 0
    {at: -0.3, expect: '0.7s'},
    {at: 0, expect: '1s'},
    {at: 0.5, expect: '1.5s'},
    {at: 1, expect: '2s'},
    {at: 1.5, expect: '2.5s'},
  ]);
}

testprop('popover-show-delay');
testprop('popover-hide-delay');
</script>