Athens 2023

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This page summarizes the plans for the Kiwix Hackathon 2023 in Athens (to not be confused with Hackathon 2023 Paris.

Date & Venue

From Thursday 18 May (evening) to Friday 26 May (morning) in Athens (we have rent a flat).


DO NOT FORGET TO BRING AN EXTENSION CORD (and an adapter if you are not joining from mainland Europe).

FYI Greece uses the same C, E and F sockets as the rest of Europe.


The main goal of the hackahton is to focus on Zimit and all its software stack: Browsertrix, warc2zim, python-libzim, ...

We want to prepare next big iteration on Zimit, considering that current version is the result of of the first iteration of 2020-21.

We need to (does not have to be in this order):



  • Increased understanding of the warc2zim implementation and the underlying Replay software greatly, thanks to the help of MGautier, Kelson, and discussions with the others
  • Began work on integrating a standard implementation (based on the current Zimit and warc2zim versions) into Kiwix JS using wombat.js and wabac.js (Service Worker)
    • Although this is not yet functional, I achieved loading of the landing page into Kiwix JS, but not yet transformation of static links via the Service Worker
    • I successfully integrated the Kiwix JS Service Worker and wabac.js into a single Service Worker, with the Fetch routed first to wabac.js, and handed off to Kiwix JS SW when needing to extract assets from the ZIM
    • I successfully managed to load wombat.js into the iframe document, but the configuration is not yet correct
    • Work so far is in
    • EDIT 4/12/2023 This goal is now achieved and is in preview release in the Browser Extension offline-first PWA v3.11.5+
  • Worked on ironing out several issues with my non-SW-based implementation in KJSWL, using knowledge gleaned at the Hackathon
    • Greatly increased fidelity of rendering of Zimit-based archives, including a lot of dynamic content
    • As a good test, mesquartierschinois now loads flawlessly in the KJSWL implementation fully offline, with dynamic loading of the entries as the user scrolls. YouTube videos work and stream offline, but Vimeo is not implemented (it is a separate fuzzy transformation)
    • Many other dynamic ZIMs are now working very well
    • A severe issue with the app attempting to load assets as main pages has been resolved
    • Loading is pretty fast at least on a desktop PC, but it also runs on iOS acceptably (only in Safari). Android is slow but useable, especially once a site's assets are cached via Cache API. N.B. On Android, it is not possible to use Firefox, because Firefox for Android unfortunately has a bug which attempts to load the ZIM archive into memory or internal storage, which fails for large archives. Chrome / Edge or Samsung Internet work fine (the fastest is Samsung Internet due to its optimized file reading speed).
    • An implementation with the many changes can be tested at


Succeed to create a POC of warc2zim creating zim files with static rewriting and so not needing a Service Worker.


From Friday to Sunday there is the Wikimedia Hackathon for which at least Matthieu and Kelson has registered.

After that we will be all gathered to focus on Zimit.


  • Reg (remote)
  • Kelson
  • MGauthier
  • Jaifroid
  • Ilya (maybe)


  • Hosting: CHF 1'874.05
  • F&B: CHF 737.24
  • Travel: 1'469.05