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This article explains the risks and issues caused by unescaped or malformed HTML in titles and how to handle them safely.

The problem

When a title contains raw HTML or fragments like and , it can:

  • Break page layout or styling.
  • Cause JavaScript errors if attributes are incomplete.
  • Create security risks if user input is rendered without escaping (e.g., XSS).

How to sanitize and handle such titles

  1. Escape HTML before rendering
    • Convert < to <, > to >, & to &, “ to ”, and ‘ to ’.
  2. Validate input length and characters
    • Reject or truncate overly long strings; restrict control characters.
  3. Use a safe rendering method
    • Insert as textContent / innerText rather than innerHTML in browsers.
  4. Log and notify on malformed inputs
    • Record occurrences for monitoring and optionally alert developers.
  5. Provide user-friendly fallback**
    • Replace malformed segments with an ellipsis or a placeholder like ”[Invalid characters]“.

Example (conceptual)

  • Original title: and Escaped for display: and Safe DOM insertion: element.textContent = escapedTitle

Developer checklist

  • Implement server-side and client-side escaping.
  • Use CSP headers to reduce XSS impact.
  • Add unit tests for edge cases with broken HTML.
  • Sanitize inputs stored in databases.

Conclusion

Treat titles containing HTML fragments as untrusted input: escape, validate, and render them as plain text to avoid layout issues, errors, and security vulnerabilities.

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