Simon Willison’s Weblog

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IE8 Security Part IV: The XSS Filter (via) IE8 will include an XSS filter to identify and neutralise “reflected” XSS attacks (where malicious code in a query string is rendered to the page), turned on by default. Sounds like a good idea to me, and site authors can disable it using Yet Another Custom HTTP header (X-XSS-Protection: 0).