Set data-sd-animate=” — Fixing Broken HTML and Safely Displaying User Input
Problem overview
When a title or user input contains incomplete or unescaped HTML (for example: Set ), it can break page layout, trigger browser parsing errors, or inadvertently enable cross-site scripting (XSS). The goal is to display such strings safely and clearly, and—if the text should contain HTML—repair or sanitize it.
Safe display (escape HTML)
To show the raw string without letting the browser interpret it, escape special characters:
- Replace
<with< - Replace
>with> - Replace
“with” - Replace
&with&
Example output (escaped):
Set
Sanitize and allow specific attributes (if HTML is intended)
If you want to permit some HTML (e.g., certain tags/attributes), use a trusted sanitizer library (DOMPurify, sanitize-html). Configure it to allow only safe tags and attributes, and to strip incomplete tags or unsafe attribute values.
Example using DOMPurify (conceptual):
- Allow tag: span
- Allow attribute: data-sd-animate (only if value matches a safe pattern)
- Remove dangling/incomplete tags
Repairing or completing broken HTML (if desired)
If the intention was a complete element, reconstruct it deterministically:
- If the attribute value is missing, prompt a default or close the tag safely:
…content… - If content is unknown, use a placeholder:
[content]
Server-side validation and logging
- Validate inputs server-side; never rely only on client-side checks.
- Log malformed inputs for debugging (avoid logging sensitive data).
Display guidance for CMS/editors
- Show a preview with escaped HTML by default.
- Offer an “Allow HTML” toggle that runs sanitization before rendering.
- Provide inline suggestions to complete malformed tags.
Quick checklist
- Escape by default.
- Sanitize when allowing HTML.
- Reconstruct only with strict rules.
- Validate server-side.
- Log and monitor malformed inputs.
This ensures strings like Set
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