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)