div { display: inline-block; }
<div class="grid-1">
1
</div><div class="grid-6">
6
</div>
</div><div class="grid-11">
11
</div>
div { display: table; }
div ul { display: table-row; }
div ul li { display: table-cell; }
<div>
<ul>
<li class="grid-1">
1
</li>
<li class="grid-6">
6
</li>
<li class="grid-11">
11
</li>
</ul>
</div>
<meta name="format-detection" content="telephone=no">
<meta http-equiv="x-rim-auto-match" content="none">