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    body { font-family: 'Ahem'; color:green }
    .hang { white-space:pre; margin:1em; width:5em; border:2px solid black }
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<div style="float:left" class="hang">12 34,</div>
<div style="clear:both">
<div class="hang">12 34,
1234,</div>
<div class="hang" style="text-align:justify;">12 34,</div>
<div class="hang">12 34,<br>12345</div>
<div class="hang">12
34,56
1234<br>12345</div>
<div class="hang">12
34,56
1234<br>12345</div>