[Elsie]

... even after following the HTML to the source (where I could see it).

Just where IS the source?

[null and void]

If you can see a broken image square, right click and select ‘copy image location’.

If it’s a blank space, select everything one line above it to one line below, right click ‘view selection source’.

Don’t know how to do it in windows land, but it’s probably similar.