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<!DOCTYPE html>
<html>
<title>W3.CSS</title>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.com/w3css/5/w3.css">
<body>
​
<div class="w3-container">
  <h2>Filter Dropdown Hover</h2>
  <p>Mouse-over the dropdown and search for a specific link inside the input field.</p>
  <div class="w3-dropdown-hover">
    <button class="w3-button w3-black">Dropdown</button>
    <div class="w3-dropdown-content w3-bar-block w3-card w3-light-grey" id="myDIV">
      <input class="w3-input w3-padding" type="text" placeholder="Search.." id="myInput" onkeyup="myFunction()">
      <a class="w3-bar-item w3-button" href="#about">About</a>
      <a class="w3-bar-item w3-button" href="#base">Base</a>
      <a class="w3-bar-item w3-button" href="#blog">Blog</a>
      <a class="w3-bar-item w3-button" href="#contact">Contact</a>
      <a class="w3-bar-item w3-button" href="#custom">Custom</a>
      <a class="w3-bar-item w3-button" href="#support">Support</a>
      <a class="w3-bar-item w3-button" href="#tools">Tools</a>
    </div>
  </div>
</div>
​
<script>
// Filter
function myFunction() {
  var input, filter, ul, li, a, i;
  input = document.getElementById("myInput");
  filter = input.value.toUpperCase();
  div = document.getElementById("myDIV");
  a = div.getElementsByTagName("a");
  for (i = 0; i < a.length; i++) {
    txtValue = a[i].textContent || a[i].innerText;
    if (txtValue.toUpperCase().indexOf(filter) > -1) {
      a[i].style.display = "";
    } else {
      a[i].style.display = "none";
    }
  }
}
</script>
​