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A comment on Ask HN: Testing your site for XSS exploits.
It's also definitely nice to have a dedicated qa person (preferably someone familiar with the code) trying to break your site, both manually and with tools like Selenium http://seleniumhq.org/
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It's also definitely nice to have a dedicated qa person (preferably someone familiar with the code) trying to break your site, both manually and with tools like Selenium http://seleniumhq.org/