Quitting the game in Unity

ExampleQuit.cs

using UnityEngine;

public class ExampleQuit
{
    public static void Quit()
    {
#if UNITY_EDITOR
        UnityEditor.EditorApplication.isPlaying = false;
#elif UNITY_WEBGL
        // Link to the website page where you want to go after clicking the exit button
        const string WEBPLAYER_QUIT_URL = "http://your-address.com";
        UnityEngine.Application.OpenURL(WEBPLAYER_QUIT_URL);
#else
        UnityEngine.Application.Quit();
#endif
    }
}