Please upgrade here. These earlier versions are no longer being updated and have security issues.
HackerOne users: Testing against this community violates our program's Terms of Service and will result in your bounty being denied.
Vanilla Doesn't Produce Valid XHTML?
I used the W3C validation service on my own Vanilla forum, and also on this very forum. In each case, there were numerous errors flagged in the pages. How concerned should I be about this?
Here's an example of what I'm talking about: