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<!DOCTYPE html> <html lang="en"> <head> <title>Bootstrap Example</title> <meta charset="utf-8"> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script> <style> body { position: relative; } ul.nav-pills { top: 20px; position: fixed; } div.col-8 div { height: 500px; } </style> </head> <body data-spy="scroll" data-target="#myScrollspy" data-offset="1"> <div class="container-fluid"> <div class="row"> <nav class="col-sm-3 col-4" id="myScrollspy"> <ul class="nav nav-pills flex-column"> <li class="nav-item"> <a class="nav-link active" href="#section1">Section 1</a> </li> <li class="nav-item"> <a class="nav-link" href="#section2">Section 2</a> </li> <li class="nav-item"> <a class="nav-link" href="#section3">Section 3</a> </li> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#">Section 4</a> <div class="dropdown-menu"> <a class="dropdown-item" href="#section41">Link 1</a> <a class="dropdown-item" href="#section42">Link 2</a> </div> </li> </ul> </nav> <div class="col-sm-9 col-8"> <div id="section1" class="bg-success"> <h1>Section 1</h1> <p>Try to scroll this section and look at the navigation list while scrolling!</p> </div> <div id="section2" class="bg-warning"> <h1>Section 2</h1> <p>Try to scroll this section and look at the navigation list while scrolling!</p> </div> <div id="section3" class="bg-secondary"> <h1>Section 3</h1> <p>Try to scroll this section and look at the navigation list while scrolling!</p> </div> <div id="section41" class="bg-danger"> <h1>Section 4-1</h1> <p>Try to scroll this section and look at the navigation list while scrolling!</p> </div> <div id="section42" class="bg-info"> <h1>Section 4-2</h1> <p>Try to scroll this section and look at the navigation list while scrolling!</p> </div> </div> </div> </div> </body> </html>