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Test Info:

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>CSS Multi-column Layout: getComputedStyle().columnWidth</title>
<meta name="assert" content="column-width computed value is the keyword auto or an absolute length.">
<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;
}
</style>
<script>
test_computed_value("column-width", "auto");
test_computed_value("column-width", "calc(10px + 0.5em)", "30px");
test_computed_value("column-width", "calc(10px - 0.5em)", "0px");
</script>
</body>
</html>