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More informative post about this from the lead LibreOffice developer https://people.gnome.org/~michael/blog/2015-03-25-libreoffic...

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"Clearly it is necessary to intercept browser keystrokes, gestures and so on, transport these over the websocket and emit them into the LibreOfficeKit core."

So it sounds like it's similar to their earlier demos, where the client is "thin" and the bulk of the work is done on the server, as opposed to being a Javascript/HTML/CSS app that runs in the browser.

Yes, they are moving out of the server those pieces that benefits the most from being client side (scrolling, cursor, selection) but the document rendering/editing is still done by a LibreOfficeKit process on the server.

Reimplementing the whole LibreOffice in JS/CSS/HTML is totally another beast (see https://news.ycombinator.com/item?id=9263233 about WebODF).

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