IconVault's Storage Access Playground walks you through the real Storage Access API step by step. Check document.hasStorageAccess() live, run the request flow from a genuine user gesture, probe first-party cookie read/write, and read your StorageManager quota estimate, all logged with timestamps in the flow panel. Every outcome is the browser's honest answer, including the important one: top-level pages cannot be granted storage access, because the API exists for embedded third-party frames. It is free and runs fully in your browser.

Third-party cookie deprecation made the Storage Access API essential for embedded widgets, logins, and payment iframes. This lab teaches the correct pattern (check first, request inside a click handler, degrade gracefully on deny), explains partitioned versus unpartitioned storage in plain terms, and ships a copyable snippet with the try/catch structure production code needs. No fake grants, no theater: if the request cannot succeed here, you see exactly why.