style-attribute-sanitization

Sanitizing CSS in style attributes involves parsing the properties and values to whitelist safe styles like color while blocking dangerous inputs like expression() and javascript: URLs to prevent injection.

Dangerous CSS values to block in style attributes include expression(), behavior, and javascript: URLs, which can execute malicious scripts. Safely sanitizing style attributes ensures these injection vectors are removed from user-generated HTML content.

Yes, you can preserve safe CSS styling like color and font-size while removing malicious code. This selective sanitization parses style attributes to block dangerous properties and values, keeping only the whitelisted safe styles intact for secure rendering.

The best way to handle CSS injection risks in user-generated HTML is to sanitize the style attributes by parsing CSS properties. This process removes dangerous vectors like expression() and javascript: URLs while retaining only safe, whitelisted styling properties.

HTML style attribute sanitization can do both. It offers options to either completely remove the style attributes or selectively sanitize them, cleaning the CSS to keep only safe styling properties while stripping out any potentially dangerous values.