RPG Maker MV
As you all know HTML5 games don't generally need exit buttons. Neither do mobile versions, as you can just Back or Home your way out. But with desktop that's a whole different thing. You do want to get out without having to resort to using CTRL+F4 or something similar.
This plugin adds this option to both the title screen as well as the Game End option.
Download (9.53 kB, 370 times downloaded)
Demo (6.45 MB, 73 times downloaded)
After you add the plugin, you can set the parameters. They're pretty much self-explanatory. "Text - Exit" and "Text - To Desktop" are the text labels for each respective button. The first appears in the title screen, the latter in the Game End window.
"Add to title" and "Add to Game End" both are boolean values, and determine whether or not the new buttons should be added.
On non-desktop browsers the game won't add the exit options. They could be made visible, but they don't work, so it's pretty useless to keep them.