Hi antpower26! welcome to the forums!
Unfortunately there is not swf export from Synfig yet. You can export to animated gif for classical animated integration into any website. Strongly recommended export using magick++ target.
Finally, Synfig can produce any kind of raster video which embedding in the browser only depends on the browser itself.
needs your help!
Developers, packagers, bug testers, translators, artists, web developers, wiki writers... you can