Example of using Timthumb with the new srcset attribute

<!-- Example of using Timthumb with the new srcset attribute -->

<img
   src="path/to/timthumb.php?src=path/to/img.jpg&height=150&width=150"
   srcset="path/to/timthumb.php?src=path/to/img.jpg&height=300&width=300 2x"
   alt="My image"
   height="150"
   width="150">