3. Strict XML/XHTML Validation, CSP & CSRF Protection
Scope: All onbits.net routes, subdomains, and support endpoints
Technical Verification: Every page is served as application/xhtml+xml and validated against a strict XML parser. Private/checkout routes enforce strict Content-Security-Policy (form-action 'self' https://checkout.stripe.com), X-Frame-Options: DENY, and double-submit CSRF tokens.