Safe HTML checker

by Simon Willison

The system I have implemented works by running submitted posts through an XML parser, which checks that each element is in my list of allowed elements, is nested correctly (you can't put a blockquote inside a p for example) and doesn't have any illegal attributes. My initial test have shown it to work pretty well, but if anyone wants to have a go at breaking it please, be my guest.

UserLand RSS 0.92 spec

by Dave Winer

UserLand RSS 0.91 spec

by Dave Winer

UserLand RSS 2.0 spec

by Dave Winer

CSS Selectors

Intro by Russell Dyer (xml.com)