A: As long as you don't clear your browser cache. To preserve games permanently, use the "Save as HTML file" method described above.

If you want to build your own offline casual setup, let me know:

You can play Oregon Trail, Doom (Shareware), SimCity 2000, Lemmings, and Commander Keen directly in your browser. Once the page loads, you can disconnect your Wi-Fi, and the emulator keeps running.

Overlay Title