TiddlyWiki is a standalone single HTML file wiki that can save itself by offering a download of modified copy of itself or storing itself on one of the many available hosting providers, e.g. saving itself to GitHub, GitLab, WebDAV etc. All these options can be removed to save space and another option to use
sendToChat() API added instead.
It is a bit too large by default, empty edition is 2.4M, but for an experiment this restriction can be removed or maybe it is possible to reduce it enough by dropping unnecessary default plugins and saving methods. Also gzipped the file
empty.html.gz is only 427K, so inside an .xdc ZIP archive it can be small.
Then the user workflow would be to save a prepared empty version of TiddlyWiki.xdc to Saved Messages, open it, edit and save a new copy via “send to chat”. No need to send any webxdc updates or merge changes, as TiddlyWiki is usually used as a personal wiki. Sending it to some chat would also be possible, but if two users edit at the same time they will send two different updated copies to the chat then and have to merge them manually.