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<!DOCTYPE html>
<html>
<body>
​
<select id="mySelect" size="1">
  <option>Cat</option>
  <option>Dog</option>
  <option>Horse</option>
  <option>Elephant</option>
  <option>Mouse</option>
  <option>Fish</option>
  <option>Cow</option>
</select>
​
<p>Click the button to change the number of visible options in the dropdown list.</p>
​
<button onclick="myFunction()">Try it</button>
​
<script>
function myFunction() {
   document.getElementById("mySelect").size = "4";
}
</script>
​
</body>
​
<!-- Mirrored from www.w3schools.com/jsref/tryit.asp?filename=tryjsref_select_size2 by HTTrack Website Copier/3.x [XR&CO'2014], Wed, 05 Jun 2019 14:48:00 GMT -->
</html>
​
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