* **Code Quality:** Simple, functional JavaScript; lacks robust error handling and input validation. * **Language Features:** Uses basic JavaScript; no modern features (async/await, modules) employed. * **Structure:** Minimal; functions are global; `checkBox` variable scope is unclear; naming inconsistent. * **Improvements:** Adopt ES6 modules, input validation, error handling; use more descriptive variable names; refactor `loadTheme` for conciseness and readability. Consider a dedicated theming library. * **Security:** The high number of critical security issues demands immediate attention and remediation. The code's simplicity doesn't negate the seriousness of the reported flaws. * **Testing:** The absence of tests is a major concern; introduce unit tests to ensure correctness and aid future development.
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