I've had a look at the code to check, and the on submit for this form deletes the draft and then let's the POST go through. Clearly, if POST fails then all is lost.

If I add an id to the post before submitting it, and include the id when I send back the HTML, then the frontend can tell that a POST has been successful. If I stash a completed post in local storage using the id as a key, then I can find and delete posts from storage at page load time (and re-submit any that should be there but aren't).

That's work that only needs to be done for logged in users, which is fine, I can do a server side check and only include the JS if the user is authenticated.

I can even add a <template> for entries that haven't been submitted, and render them at page load time.

Things to check:

• How to catch a failed POST from a form submit
• How to turn off a service worker on logout