It's a minor issue, but I was wondering if there is a way to define a static picture (png or svg) as a fallback option for an iframe in a reveal.js presentation? Sometimes it could be that some external policy is blocking the loading of the iframe and it would be nice to have something instead on the slide then. My use case would be displaying my personal webpage at the end of the presentation (with an iframe it would always show the up-to-date version).

`{background-iframe="https://page.com/"}`
2022-06-06T09:32:07Z
maxpel
Future
open
background-iframe backup option
https://github.com/quarto-dev/quarto-cli/issues/1074