The OWASP Cheat Sheet Series was created to provide a concise collection of high value information on specific application security topics.

DOMPurify - a DOM-only, super-fast, uber-tolerant XSS sanitizer for HTML, MathML and SVG. DOMPurify works with a secure default, but offers a lot of configurability and hooks. Demo:

Quick tests to evaluate the safety of various .NET XML Parsers with respect to XXE injection