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<!DOCTYPE html>
<html>
<body>
<h1>The Window Object</h1>
<h2>The setTimeout() and clearTimeout() Methods</h2>
<button onclick="startCount()">Start count!</button>
<input type="text" id="demo">
<button onclick="stopCount()">Stop count!</button>
<p>Click on "Start count!" to start the timer. The input field will count forever, starting at 0.</p>
<p>Click on "Stop count!" to stop counting. Click on "Start count!" to start the timer again.</p>
<script>
let counter = 0;
let timeout;
let timer_on = 0;
function timedCount() {
  document.getElementById("demo").value = counter;
  counter++;
  timeout = setTimeout(timedCount, 1000);
}
function startCount() {
  if (!timer_on) {
    timer_on = 1;
    timedCount();
  }
}
function stopCount() {
  clearTimeout(timeout);
  timer_on = 0;
}
</script>
</body>
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</html>