File Sandbox
Generating test file...
1. Direct Download (Link)
2. 'Save As' (File Picker API)
3. Direct Download (Button)
This button's `onClick` handler programmatically creates, clicks, and removes an `` tag to initiate the download.
4. 'Save As' (File Picker API)
Same mechanism as the button above, using the File System Access API to ensure a 'Save As' prompt appears for the user.