Bootstrap 3 Template

This is a simple Twitter Bootstrap 3 template. You can fork it to get a ready to use Bootstrap 3 fiddle.

HTML

<script src="//netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="//netdna.bootstrapcdn.com/bootstrap/3.0.0/css/bootstrap.min.css">
<script src="https://code.jquery.com/jquery-3.1.0.js"></script>
<div class="container">
  <div class="row" id="myDIV">
    <div class="col-xs-2">1</div>
  </div>
  <div class="row" id="myDIV2">
    <div class="col-xs-2">2</div>
    <div class="col-xs-2">2</div>
    <div class="col-xs-2">2</div>
  </div>
  <div class="row">
  </div>
</div>

CSS

div[class^="col-xs"] {
    background: #ffff00;
}

JavaScript

var childCount = document.getElementById("myDIV").childElementCount;
for(i = 0; i < childCount; i++) {
   document.getElementById("myDIV").children[i].className = "";
   document.getElementById("myDIV").children[i].className = "col-xs-" + (12/childCount);
}

childCount = document.getElementById("myDIV2").childElementCount;
for(i = 0; i < childCount; i++) {
   document.getElementById("myDIV2").children[i].className = "";
   document.getElementById("myDIV2").children[i].className = "col-xs-" + (12/childCount);
}