So, how do we get responsive images?
At first, I reached for shortcodes, and got about 90% of the way there. But then I realized that shortcodes cannot be invoked from the definition of a shortcode – only from the body of a piece of content.
So at that point, I reached for partials instead. Partials are slightly less ergonomic because they seem to have some strangeness around argument passing. Arguments can only be passed through a dictionary manually.
This works.
