title: How to show a placeholder-image before the real image is downloaded?
body: <p>The idea is to show a low-res version of an image before the real high-resolution image has been downloaded, ideally using an img tag. </p>
  
  <pre><code>&lt;img lowres="http://localhost/low-res-image.jpg" ng-src="http://localhost/low-res-image.jpg"&gt;
  </code></pre>
  
  <p>Low-res image would be visible first, and be replaced with high-res image after it has been downloaded. How can this be done? Is it possible to edit img.src attribute, or should something else (e.g. a wrapper div with background, or another temporary div) be created?</p>