Example

HTML
<img src="images/AlleySpringMillsmall.jpg" srcset="images/AlleySpringMillmedium.jpg 1.5x, images/AlleySpringMilllarge.jpg 2x" alt="Alley Spring Mill">
<img src="images/AlleySpringMillsmall.jpg" srcset="images/AlleySpringMillmedium.jpg 1.5x, images/AlleySpringMilllarge.jpg 2x" alt="Alley Spring Mill">