PUBLIC MARKS with tags "Content Security Policy" & "XSS attacks"

Instead of blindly trusting everything that a server delivers, CSP defines the Content-Security-Policy HTTP header that allows you to create a whitelist of sources of trusted content, and instructs the browser to only execute or render resources from those sources. Even if an attacker can find a hole through which to inject script, the script won’t match the whitelist, and therefore won’t be executed.