Test browser storage and file APIs including IndexedDB, Cache API, File System Access, and file upload/download.
Test file input, drag-and-drop upload, and multiple file selection.
Test File System Access API — open, save, and pick directories from the browser. Check showOpenFilePicker support.
Test IndexedDB online — create databases, run transactions, and verify read/write operations in your browser.
Test the Cache API: create caches, add entries, match requests, and manage cache storage.
Test Storage Manager API — check browser storage quota, usage estimates, and request persistent storage.
Detect the deprecated Web SQL Database API support in the browser.
Test download capabilities: blob downloads, data URIs, and file save picker.