AJAX GET call with Fetch API for binary files

I need a demonstration web page with a 'Download' button. Pressing this button should trigger a JavaScript routine that allows the download of a sample binary file via Fetch API. This should be an AJAX GET call, which should happen without page refresh.

This application should work for any binary files. The application should work on an Apache server without Node.js or jQuery. The sample binary can be placed in the same directory as the web page.