What is the primary security risk associated with implementing custom HTML tags that execute arbitrary JavaScript code, and how can it be mitigated?

The primary security risk associated with implementing custom HTML tags that execute arbitrary JavaScript code is the potential for introducing malicious code or vulnerabilities that can compromise website security, user data, or website functionality. Arbitrary JavaScript means the code can perform almost any action on the page, including reading cookies, modifying the DOM (Document Object Model), redirecting users, or injecting malware. If a custom HTML tag contains poorly written or intentionally malicious ....