JSFiddle - React, Tailwind, and code Playground

JavaScript

var BBoxDetect = function(success, error){
	var d = document, dom = d.getElementsByTagName('html')[0], img = d.createElement('img');
  img.addEventListener('load', success);
  img.addEventListener('error', error);
  img.setAttribute("src",'http://192.168.1.254/medias/images/pictos/wifi-med.svg');
  dom.appendChild(img);
  dom.removeChild(img);
}


/* Main Code */
var success = function(){  alert("Detection d'un abonné Bouygues !");  };
var error  = function(){  alert("Impossible de determiner si l'internaute est chez bouygue"); };
BBoxDetect(success, error)