 <p>If you wish to reduce page sizes, I would not be looking at this technique (if it's even possible), instead I would format the source code to remove all unnecessary characters (extra spaces add data to be loaded and increase the doc size). Also, make sure your css is a streamlined as possible for example.. </p> <p>If you have many duplicate classes that have to have unique ids, rather than having:</p> <pre><code> uniqueclass1{ width:100px; height:100px; background:#999; } uniqueclass2{ width:100px; height:100px; background:#999; } </code></pre> <p>You can reduce this to:</p> <pre><code> uniqueclass1, uniqueclass2{ width:100px; height:100px; background:#999; } </code></pre> <p>This will help to reduce the size.</p>