Open a Word document, edit it in the browser with WYSIWYG fidelity, save it
back as .docx — the layout painter keeps OOXML's box model so
the file round-trips cleanly. Real-time co-editing rides on a stateless Go
gateway that speaks the y-websocket protocol in roughly 120
lines.
ProseMirror schema + layout painter (forked from
eigenpal/docx-editor, MIT) keeps Word's box model intact
through every edit. Round-trips audited per-tag — 44 of 44 fixtures
pristine = 100%, with a published gap matrix.
No DB, no on-disk update log. The gateway implements the
y-websocket protocol in ~120 lines, brokers frames between
room members, and drops the room when the last client disconnects.
Document persistence is owned by the host.
Yjs + y-prosemirror. Each room is a single in-memory
Y.Doc. A 5-second smoke test proves text fan-out,
awareness, and live filename rename across two peers — every
push runs it. Share-link model for v0; WOPI / JWT slot in
behind one Go interface.
Real .docx files across four categories (Personal, Work,
Education, Career), each with a first-page PNG preview rendered via
LibreOffice. Title-bar logo click returns to the gallery — the Google
Docs pattern.
Every push runs the suite against LibreOffice and OnlyOffice
DocumentBuilder, then compares. Word-compat heuristics live behind an
opt-in wordCompat flag for non-spec behaviour (e.g. the
last-row closing border, issue #395).
One Go interface (host.Integration) with a concrete
inline impl for the v0 share-link flow. WOPI and JWT-secured REST
API slot in for v1+ without touching the WebSocket layer.
y-prosemirror Go 1.24 y-websocket protocol LibreOffice fidelity harness docker run -p 8080:8080 schnsrw/casual-editor:latest