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You'll write better code if you do the work to move code into external resources.Inline style is treated in the same way: both the tags should be consolidated into external stylesheets to protect against a variety of surprisingly clever data exfiltration methods that CSS enables.For example, the Google 1 button at the bottom of this page loads and executes code from HTTP header, which 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.This is a huge problem, as browsers trust all of the code that shows up on a page as being legitimately part of that page's security origin.

The list below represents the state of the directives as of level 2. Regardless of the header you use, policy is defined on a page-by-page basis: you'll need to send the HTTP header along with every response that you'd like to ensure is protected.

If an attacker successfully injects code at all, it's pretty much game over: user session data is compromised and information that should be kept secret is exfiltrated to The Bad Guys. This overview highlights a defense that can significantly reduce the risk and impact of XSS attacks in modern browsers: Content Security Policy (CSP).

The issue exploited by XSS attacks is the browser's inability to distinguish between script that's part of your application and script that's been maliciously injected by a third-party.

CSP solves this problem by banning inline script entirely: it's the only way to be sure.

This ban includes not only scripts embedded directly in The rewritten code has a number of advantages above and beyond working well with CSP; it's already best practice, regardless of your use of CSP.

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