KSS Style Guide

7.1.12 #Font - Size - u3 .fs-u3

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Sets the font-size an element to the variable for u3.

Examples
Default styling
A div
.fs-u3
Sets the font-size an element to the variable for u3
A div
Markup
<div class="[modifier class]">A div</div>
Source: dist/full/full.css, line 9957