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chromium/third_party/blink/web_tests/external/wpt/css/css-typed-om/the-stylepropertymap/properties/border-width.html 

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<title>border width properties</title>
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-get">
<link rel="help" href="https://drafts.css-houdini.org/css-typed-om-1/#dom-stylepropertymap-set">
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<script src="resources/testsuite.js"></script>
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<script>
'use strict';

function assert_is_zero_px(result) {
  assert_style_value_equals(result, new CSSUnitValue(0, 'px'));
}

for (const suffix of ['top', 'left', 'right', 'bottom']) {
  runPropertyTests('border-' + suffix + '-width', [
    // Computed value is 0 when border-style is 'none'.
    // FIXME: Add separate test where border-style is not 'none' or 'hidden'.
    {
      syntax: 'thin',
      computed: (_, result) => assert_is_zero_px(result)
    },
    {
      syntax: 'medium',
      computed: (_, result) => assert_is_zero_px(result)
    },
    {
      syntax: 'thick',
      computed: (_, result) => assert_is_zero_px(result)
    },
    {
      syntax: '<length>',
      specified: assert_is_equal_with_range_handling,
      computed: (_, result) => assert_is_zero_px(result)
    },
  ]);
}

</script>