Example
tightest
line
height
line
height
tight
line
height
line
height
natural
line
height
line
height
base
line
height
line
height
loose
line
height
line
height
looser
line
height
line
height
loosest
line
height
line
height
Markup
<div class="grid-12 grid-parent">
<div class="grid-1 text_lineHeightTightest">tightest<br/>line<br/>height</div>
<div class="grid-1 text_lineHeightTight">tight<br/>line<br/>height</div>
<div class="grid-2 text_lineHeightNatural">natural<br/>line<br/>height</div>
<div class="grid-2 text_lineHeightBase">base<br/>line<br/>height</div>
<div class="grid-2 text_lineHeightLoose">loose<br/>line<br/>height</div>
<div class="grid-2 text_lineHeightLooser">looser<br/>line<br/>height</div>
<div class="grid-2 text_lineHeightLoosest">loosest<br/>line<br/>height</div>
</div>
Source:
text/fonts.less
, line 47