JSFiddle - React, Tailwind, and code Playground

HTML

<svg id="svg" width="100%" height="800">
</svg>

JavaScript

var cont = 0;

function horloge_dynamique(x, y, diametre, decalage) {

    var myCont = cont;
    var svg = document.getElementById('svg');
    cont++;

    //cree circle
    var newCircle = document.createElementNS('http://www.w3.org/2000/svg', 'circle');
    newCircle.setAttributeNS(null, 'id', 'circle' + myCont);
    newCircle.setAttributeNS(null,'stroke-width', 2);
    newCircle.setAttributeNS(null,'stroke', 'black');
    newCircle.setAttributeNS(null,'fill', 'Aqua');
    svg.appendChild(newCircle);

    //cree aiguille heure
    var newLine = document.createElementNS('http://www.w3.org/2000/svg', 'line');
    newLine.setAttributeNS(null, 'id', 'heure' + myCont);
    newLine.setAttributeNS(null, "stroke", "red");
    newLine.setAttributeNS(null, "stroke-width", "4");
    svg.appendChild(newLine);

    //cree aiguille minute
    var newLine = document.createElementNS('http://www.w3.org/2000/svg', 'line');
    newLine.setAttributeNS(null, 'id', 'min' + myCont);
    newLine.setAttributeNS(null, "stroke", "orange");
    newLine.setAttributeNS(null, "stroke-width", "2");
    svg.appendChild(newLine);

    //cree aiguille seconde
    var newLine = document.createElementNS('http://www.w3.org/2000/svg', 'line');
    newLine.setAttributeNS(null, 'id', 'sec' + myCont);
    newLine.setAttributeNS(null, "stroke", "black");
    newLine.setAttributeNS(null, "stroke-width", "1");
    svg.appendChild(newLine);

    //var circle = document.getElementById("circle_horloge");
    var circle = document.getElementById("circle" + myCont);
    circle.setAttribute("cx", x);
    circle.setAttribute("cy", y);
    circle.setAttribute("r", diametre);

    //heure
    //var aiguille_heure = document.getElementById("heure");
    var aiguille_heure = document.getElementById("heure" + myCont);
    aiguille_heure.setAttribute("x1", x);
    aiguille_heure.setAttribute("y1", y);
    aiguille_heure.setAttribute("x2", x);
    aiguille_heure.setAttribute("y2", (y - diametre) + diametre / 3);

   ...