  &lt;div class="col-md-1-3"&gt;&lt;/div&gt;<span class="fake-comment"> // col-xs-1-1 and col-sm-1-1 are assumed</span>
<!--     -->&lt;/div&gt;
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          <pre class="grid-frow-code visible-md visible-lg">
<!--     --><span class="fake-comment">// Shrink your browser window to see the columns stack as if they were 1-1 instead of 1-3</span>
<!--   --></pre>
          <pre class="grid-frow-code visible-xs visible-sm">
<!--     --><span class="fake-comment">// Expand your browser window to see