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Test Info:

<html><head>
<style>
#colset { width: 200px;
column-count: 3;
column-gap: 4px;
padding: 4px;
outline: 1px orange solid; }
#b { height: 10px;
outline: 1px green dotted;}
#c { height: 12px; /* Create overflow for #b */
background: yellow;}
</style></head><body><div id="colset"><div id="b"><div id="c"></div></div></div>
</body></html>