responsive-image

Defines a responsive image.

Top-level properties:

• fallback - the URL of a fallback image if responsive images are not supported.
• alt - alt text for the image.

Child element properties:

• min-width - the minimum width the viewport should be to display this child image.
• src - URL of the child image
• src-high-res - URL of a @2x density image for retina display (optional).