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 directory picking.
Test IndexedDB: create databases, transactions, and verify read/write operations.
Test the Cache API: create caches, add entries, match requests, and manage cache storage.
Test the Storage Manager API: estimate quota/usage 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.