​x
 
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<!DOCTYPE html>
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<title>My Example</title>
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​
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<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
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<script>
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  $( function() {
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    $( "button" ).click( function() {
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      $( "li" ).eq( 4 ).css( "background-color", "yellow" );
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    });
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  });
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</script>
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​
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<button>Highlight the 5th list item</button>
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​
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<ul>
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  <li>Apples
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    <ul>
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      <li>Big ones</li>
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      <li>Juicy ones</li>
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      <li>Red ones</li>
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    </ul>
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  </li>
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  <li>Oranges</li>
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  <li>Papaya
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    <ul>
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      <li>Papaya carica</li>
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      <li>Carica</li>
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      <li>Carica pubescens</li>
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    </ul>
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  </li>
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  <li>Lychee</li>
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  <li>Rambutan</li>
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  <li>Passionfruit</li>
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  <li>Mango</li>
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</ul>