Automatically switch to webgl2.0 emulation in editor start, if target platform is webgl

Startup.cs

using UnityEngine;
using UnityEditor;

[InitializeOnLoad]
public class Startup
{
    static Startup()
    {
        if (EditorUserBuildSettings.activeBuildTarget == BuildTarget.WebGL)
        {
            // delay until menu is ready
            EditorApplication.delayCall = () =>
            {
                Debug.Log("Switching Graphics Emulation to WebGL 2.0");
                EditorApplication.ExecuteMenuItem("Edit/Graphics Emulation/WebGL 2.0");
            };

        }
    }
}