Strectch div to fit background image : <p>Can I stretch a div to fit the background image's width and height using only CSS? And if yes, how?<br>
Div has width and height unset.    </p>

<p>I am <strong>NOT</strong> asking how to scale the image into a div.<br>
I am <strong>NOT</strong> asking how to scale the image into a div with specific width and height.</p>

<p>ie.</p>

<pre><code>   &lt;div class="banner" 
        styles="width: auto; height: auto; background-image: url(unknown-size-img.jpg)"&gt;
   &lt;/div&gt;
</code></pre>
