Oh I didn’t mean to have that in there – left it in from some testing. It adds some nice features for responsive images based on media queries. You could pair this markup with Hype’s responsive layouts to speed up image loading for smaller layouts:
<picture>
<source srcset="examples/images/extralarge.jpg" media="(min-width: 1000px)">
<source srcset="examples/images/art-large.jpg" media="(min-width: 800px)">
<img srcset="examples/images/art-medium.jpg" alt="…">
</picture>
In Hype, you may need to run picturefill(); ‘On Prepare for Display’ to ensure it is triggered. But it automatically will run on a browser resize.
DEMO: https://scottjehl.github.io/picturefill/examples/demo-03.html