.comPX {
font: 14px/1px Arial;
}
.comPT {
font: 14px/1pt Arial;
}
.sem {
font: 14px/1 Arial;
}
<div class="comPX">
Olá mundo, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo
</div>
<hr>
<div class="comPT">
Olá mundo, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo
</div>
<hr>
<div class="sem">
Olá mundo, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo, bar, foo
</div>