dth: 60px; &amp; border-left-width: 2px; &amp; border-right-width: 4px;</pre>

<div class="grid" data-expected-width="76">
  <div class="minWidth60 borderLeft2 borderRight4" data-expected-width="66"></div>
  <div data-expected-width="66"></div>
</div>

<pre>Item width: 60px; &amp; margin-left: 5px; &amp; margin-right: 10px; &amp; padding-left: 6px; &amp; padding-right: 3px; &amp; border-left-width: 2px; &amp; border-right-width: 4px;</pre>

<div class="grid" data-expected-width="100">
  <div class="width60 