Would be great to be able to set a time (or even just choose first or last frame) as a 'backup' image and export it along with the html as a gif or jpg.
Thanks for the request! There's definitely a lot of areas this would be useful from fallbacks to poster images for ads.
Just went through 20 ads taking screen caps and cropping off a pixel or two here and there. A thousand times yes to this request.
High on the list. One workaround for now could be to export the entire animation as a PNG Sequence, and then choose one image from there.