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This skill provides a comprehensive methodology for detecting, exploiting, and remediating HTML injection vulnerabilities within web applications. It guides users through the entire security testing lifecycle—from mapping injection surfaces and testing basic payloads to constructing advanced phishing simulations and defacement proofs. By offering detailed remediation guidance and secure coding patterns across multiple languages, it serves as an essential resource for penetration testers and developers aiming to harden their applications against unauthorized content modification and credential theft.