I'm trying to display an image usign holder.js but instead of the image the example image is being shown.
<img src='http://upload.wikimedia.org/wikipedia/sr/0/0c/Firefox-logo.png' data- src="holder.js/140x140" alt='Thumbnail' class="img-thumbnail img-responsive"/>
Is this the correct method of using holder.js? Can someone post an example for displaying an image using holder.js?