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<!DOCTYPE html>
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<title>My Example</title>
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​
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<!-- Latest compiled and minified Bootstrap CSS -->
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
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​
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<style>
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body {
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padding-top: 1em;
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}
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</style> <div class="container-fluid">
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<ul class="nav nav-pills">
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<li class="nav-item">
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<a class="nav-link active" href="#">HTML</a>
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</li>
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​
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<li class="nav-item">
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<a class="nav-link" href="#">CSS</a>
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</li>
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​
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<li class="nav-item">
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<a class="nav-link" href="#">JavaScript</a>
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</li>
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​
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<li class="nav-item dropdown">
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<a class="nav-link dropdown-toggle" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false">
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Preview
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</a>
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<div class="dropdown-menu" aria-labelledby="Preview">
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<a class="dropdown-item" href="#">Mobile Phone</a>
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<a class="dropdown-item" href="#">Tablet</a>
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<a class="dropdown-item" href="#">Laptop</a>
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<a class="dropdown-item" href="#">Desktop</a>
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</div>
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</li>
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​
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</ul>
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​
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</div>
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<!-- jQuery library -->
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<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
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​
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<!-- Popper -->
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<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
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​
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<!-- Latest compiled and minified Bootstrap JavaScript -->
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<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
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​
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<!-- Initialize Bootstrap functionality -->
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<script>
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// Initialize tooltip component
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$(function () {
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  $('[data-toggle="tooltip"]').tooltip()
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})
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​
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// Initialize popover component
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$(function () {
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  $('[data-toggle="popover"]').popover()
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})
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</script>