FAQ-000282 - CSS and UI Security / Dynamic CSS Styling Security

Yes, dynamic CSS styling hooks are allowed in Lightning components during security review, provided they adhere to specific guidelines: **Requirements for Approval:** 1. **CSS must be included as static resources**: Avoid dynamically loading CSS from third-party sources to ensure compliance with security policies and prevent vulnerabilities 2. **Follow secure practices**: Reference CSS from static resources and adhere to Salesforce's security guidelines 3. **Integrity checks**: Dynamically loading CSS from third-party endpoints isn't permitted unless it includes an integrity check **Important Guidelines:** - CSS must be included as **static resources** rather than being dynamically loaded from third-party sources - This ensures compliance with security policies and maintains proper namespace isolation - External dependencies should be avoided to prevent security vulnerabilities - All CSS should be properly version-controlled within the package - Category: CSS and UI Security - Subcategory: Dynamic CSS Styling Security

The main recommendation focused on improving conversational tone by changing 'is not permitted' to the more conversational contraction 'isn't permitted', following the brand guidelines that emphasize using contractions to maintain a natural, conversational tone. The selected security rules directly relate to the FAQ content: LoadCSSLinkHref relates to the FAQ's guidance about CSS loading security, specifically the discussion of 'dynamically loading CSS from third-party sources' and the need for integrity checks. LoadCSSApexStylesheet relates to the requirement that 'CSS must be included as static resources' as this rule addresses CSS loading practices in Salesforce components. AvoidCreateElementScriptLinkTag relates to the FAQ's emphasis on avoiding dynamic loading from external sources, as this rule covers security concerns around dynamically creating link tags which could be used for CSS loading.