Standard HTML
-
picture
-<picture>
element surrounding a<source>
tag for each required srcset, and a fallback<img>
:<picture> <source srcset="..." sizes="..." media="..." type="..."> <source srcset="..." sizes="..." media="..." type="..."> (...) <img src="..."> </picture
-
img
- a single<img>
tag with asrcset
entry:<img src="..." srcset="..." sizes="..." alt="..." width="..." height="...">
-
auto
- Supply an img tag when you have only one srcset, otherwise supply a picture tag.