css/css-multicol/parsing/column-rule-computed.html

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Multi-column Layout: getComputedStyle().columnRule</title>
<link rel="help" href="https://drafts.csswg.org/css-multicol/#propdef-column-rule">
<meta name="assert" content="column-rule computed value is as specified.">
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/css/support/computed-testcommon.js"></script>
<style>
  #reference {
    column-rule-style: dotted; /* Avoid column-rule-width computed style 0px */
    column-rule-width: medium;
  }
  #target {
    color: lime;
  }
</style>
</head>
<body>
<div id="reference"></div>
<div id="target"></div>
<script>
const currentColor = 'rgb(0, 255, 0)';
const mediumWidth = getComputedStyle(document.getElementById('reference')).columnRuleWidth; // e.g. 3px

test_computed_value("column-rule", "10px", "0px none " + currentColor);
test_computed_value("column-rule", "dotted", mediumWidth + " dotted " + currentColor);
test_computed_value("column-rule", "0px none rgb(255, 0, 255)");
test_computed_value("column-rule", "10px dotted rgb(255, 0, 255)");

test_computed_value("column-rule", "medium hidden currentcolor", "0px hidden " + currentColor);
test_computed_value("column-rule", "medium solid currentcolor", mediumWidth + " solid " + currentColor);
</script>
</body>
</html>