You should make sure whatever solution you finally end up choosing can beat the XSS Cheat Sheet
. That will require testing in a lot of different browsers on a lot of different machines.
You should also seriously ask these questions:
- Do the users really need any markup at all?
- If they do, does it have to be HTML?
- If they do, can it be a very limited set of tags?
You may find that you'll be able to choose a simpler means of filtering depending on your answers.
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