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<!DOCTYPE html> <html> <body> <h2>JavaScript Web Workers API</h2> <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() { if(typeof(w) == "undefined") { w = new Worker("demo_workers.js"); } w.onmessage = function(event) { document.getElementById("result").innerHTML = event.data; }; } function stopWorker() { w.terminate(); w = undefined; } </script> </body> </html>