The schema-relative or protocol relative URLs are common while porting old sites to Eleventy.

<img
  alt="A head of a tiger"
  src="//upload.wikimedia.org/wikipedia/commons/f/fd/Ghostscript_Tiger.svg"
>

Presently, when using such URL, new Image() gives the error:

Error: ENOENT: no such file or directory, stat '//upload.wikimedia.org/wikipedia/commons/f/fd/Ghostscript_Tiger.svg'

Is adding support for schema-relative URLs useful for our users?

See: saneef/eleventy-plugin-img2picture#27