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chromium/third_party/blink/web_tests/external/wpt/css/css-multicol/parsing/column-rule-width-computed.html 

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Multi-column Layout: getComputedStyle().columnRuleWidth</title>
<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-column-rule-width">
<meta name="assert" content="column-rule-width computed value is absolute length.">
<meta name="assert" content="column-rule-width computed value is 0 if the column rule style is none or hidden.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
</head>
<body>
<div id="target"></div>
<style>
  #target {
    font-size: 40px;
    column-rule-style: dotted;
  }
</style>
<script>
test_computed_value("column-rule-width", "calc(10px + 0.5em)", "30px");
test_computed_value("column-rule-width", "calc(10px - 0.5em)", "0px");

// thin, medium, thick computed values not yet tested

test(() => {
  target.style.columnRuleWidth = '10px';
  assert_equals(getComputedStyle(target).columnRuleWidth, '10px');

  target.style.columnRuleStyle = 'none';
  assert_equals(getComputedStyle(target).columnRuleWidth, '0px');

  target.style.columnRuleStyle = 'outset';
  assert_equals(getComputedStyle(target).columnRuleWidth, '10px');

  target.style.columnRuleStyle = 'hidden';
  assert_equals(getComputedStyle(target).columnRuleWidth, '0px');

  target.style.columnRuleStyle = '';
}, 'column-rule-width is 0 when column-rule-style is none or hidden');
</script>
</body>
</html>