'Fallback Image' support
... I would like to see an option within SD to enable a 'Fallback Image', similar to 'Fallback Font' already available ...
Experimenting with .webp files confirms the significantly smaller size for the same resolution, and the fallback seems technically simple. I put into an SD HTML Element the formula from https://css-tricks.com/webp-with-fallback/ i.e.
It works fine, but one doesn't get the preview in the SD canvas.
I therefore hope that the suggestion will be implemented.