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<!DOCTYPE html>
<html>
<head>
<script src="../../ajax.googleapis.com/ajax/libs/jquery/3.4.0/jquery.min.js"></script>
<script>
$(document).ready(function(){
  $("button").click(function(){
    alert($("li").length);
  });
});
</script>
</head>
<body>
​
<button>Alert the number of li elements</button>
​
<ul>
  <li>Coffee</li>
  <li>Milk</li>
  <li>Soda</li>
</ul>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jquery/tryit.asp?filename=tryjquery_prop_length by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:34:09 GMT -->
</html>
​
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