<head>
    <style>
        body { font-family: 'Ahem'; color:green }
        .hang { margin:1em; border:1px solid black }
        </style>
</head>
<body>
    <div style="float:left" class="hang"><div style="margin: 0 -1em">(Hang test)</div></div>
    <div style="clear:both">
        <div class="hang" style="width:10em; text-align:justify;"><span style="margin:0 -1em">(This should hang.<br>(This should also hang.)</span></div>