Chat animator currently must be served from a fileserver. Cannot be used locally with file:// because Javascript modules do not support that.
Otherwise it is library free javascript and ready to go.
char1, char2 and char3 vector graphics courtesy of rootworks on OpenClipart.org (https://openclipart.org/artist/rootworks).
favicon.ico courtesy of Memed Nurrohmad on pixabay.com (https://pixabay.com/users/memed_nurrohmad-3307648/).
Animated gif export support courtesy of jnordberg (https://github.com/jnordberg/gif.js/).