Picture standard - lazy loaded (default)
Outputs a webp source plus a fallback. The webp filename is derived from the image name. Images load lazily unless fetchpriority is set.
Picture standard - high fetch priority
Use for the first image on the page (above the fold). Switches loading="lazy" for fetchpriority="high".
Picture standard - PNG fallback
The format argument sets the MIME type of the fallback source. It defaults to jpeg.
Picture background - JPEG
Outputs an inline style attribute with an image-set() background, for use on any element.