Unity webgl mobile end removal warning

modify Build\UnityLoader.js.
Replace the following code with false

UnityLoader.SystemInfo.mobile // Replace with false
["Edge", "Firefox", "Chrome", "Safari"].indexOf(UnityLoader.SystemInfo.browser) == -1 // Replace with false

To avoid manual changes every time you build , Use PostBuildHandler Script .Editor Create PostBuildHandler Script

using System;
using System.IO;
using UnityEditor;
using UnityEditor.Callbacks;

public class PostBuildHandler
{
    [PostProcessBuild]
    public static void OnPostProcessBuild(BuildTarget target, string targetPath)
    {
        if (target != BuildTarget.WebGL) return;
        var path = Path.Combine(targetPath, "Build/UnityLoader.js");
        var text = File.ReadAllText(path);
        text = text.Replace("UnityLoader.SystemInfo.mobile", "false");
        text = text.Replace("[\"Edge\",\"Firefox\",\"Chrome\",\"Safari\"].indexOf(UnityLoader.SystemInfo.browser)==-1", "false");// Notice the spaces in the string 
        File.WriteAllText(path, text);
    }
}