v150 · CSS · Security
CORS Header Playground
CSS URL request modifiers — cross-origin(), referrer-policy(), and integrity() — affect which HTTP headers are sent with CSS-triggered resource fetches. Configure each modifier below and see exactly which request headers are added, modified, or suppressed.
Configure URL modifiers
cross-origin()
referrer-policy()
integrity()
Resulting request headers
HTTP Header
Value sent
Modifier responsible
Select modifier values above to see how they affect the request headers.
see also
- Modifier Builder — visual url() modifier composer
- Cross-Origin & Integrity Demo — live fetch with headers
- Integrity Chain Demo — chained integrity checks
- Referrer Policy Demo — referrer header behavior
references
implementation reference
Need the exact API surface, compatibility boundaries, errors, lifecycle, and source links? Read the matching gendn reference ↗