I just added PDF and RTF export to KBdocs.com

I have been writing the KBdocs.com online word processor for my own use, but it is also freely available to anyone who wants to create a login account for themselves.

I found the old export as a HTML fragment file to be fairly useful for exporting from the web site to a local word processor, but RTF is a little more convenient. While I was adding RTF export functionality I decided to also implement PDF file generation.

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