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<html><body><h1>Web Worker API</h1><p>Count numbers: <output id="result"></output></p><button onclick="startWorker()">Start Worker</button> <button onclick="stopWorker()">Stop Worker</button><script>let w;function startWorker() { const x = document.getElementById("result"); if(typeof(Worker) !== "undefined") { if(typeof(w) == "undefined") { w = new Worker("demo_workers.js"); } w.onmessage = function(event) { x.innerHTML = event.data; }; } else { x.innerHTML = "Sorry! No Web Worker support."; }}function stopWorker() { w.terminate(); w = undefined;}</script></body></html>