I have big HTML project and I want to divide one big HTML file into separate small html files. Is there a good way to do it?
This is an example of my HTML file (this is not all since the original html is much bigger)
http://plnkr.co/edit/gwdAHfGIeac9WusLKMlV?p=preview
<!DOCTYPE html>
<html>
<head>
  <title>toolbar</title>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <link rel="stylesheet" href="styles.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="toggle-button">
  <div class="wrapper">
    <div class="menu-bar menu-bar-top"></div>
    <div class="menu-bar menu-bar-middle"></div>
    <div class="menu-bar menu-bar-bottom"></div>
  </div>
</div>
  <!-- remove from here!!!! -->
<nav id="navi" class="navbar-inverse menuBar">
  <div class="container-fluid back">
    <div class="navbar-header">
      <a class="navbar-brand glyphicon glyphicon-plus" title="Home"  href="#"></a>
    </div>
    <ul class="nav navbar-nav">
      <li id="dropdown1" title="Dropdown one" class="dropdown keep-open">
        <a id="qlabel" class="dropdown-toggle glyphicon glyphicon-ok" data-toggle="dropdown" href="#">
        <span class="caret"></span></a>
        <ul class="dropdown-menu">
        <div class="panel-group" id="accordion">
  <div class="panel panel-default">
    <div class="panel-heading">
        <a data-toggle="collapse" data-parent="#accordion" href="#collapse3" title="Third group" >
        Collapsible Group 3</a>
    </div>
    <div id="collapse3" class="panel-collapse collapse">
      <div class="panel-body">
      </div>
    </div>
  </div>
</div>
        </ul>
      </li>
      <li><a href="#" id="list1" class="glyphicon glyphicon-flag" title="List 1"  onclick="list1(this)"></a></li>
    </ul>
     <ul class="nav navbar-nav navbar-right">
<li class="dropdown">
       <a class="dropdown-toggle glyphicon glyphicon-time" title="Notifications" data-toggle="dropdown" href="#" >
         <span class="badge badge-print">2</span><span class="caret"></span>
        </a>
        <ul class="dropdown-menu notif" style="padding:20%;">
          <li>Hello</li>
        </ul>
      </li>
 <li class="dropdown">
        <a class="dropdown-toggle glyphicon glyphicon-user" title="Languages" data-toggle="dropdown" href="#">
        <span class="caret"></span></a>
        <ul class="dropdown-menu">
          <li><a href="#" onclick="language(this)">English</a></li>
        </ul>
      </li>
      <li><a href="#" onclick="logout()" title="Logout"><span class="glyphicon glyphicon-log-in"></span> </a></li>
    </ul>
  </div>
</nav>
<p style="margin-left:25%; margin-top:5%;"><iframe src="http://stackextance.com"  frameborder="0" width="660px" height="270px" marginheight="0" marginwidth="0" scrolling="No"><p>See the World Forests Clock at <a href="http://www.cifor.org/fileadmin/world-forest-c/wfc-cifor.htm">http://www.cifor.org/fileadmin/world-forest-c/wfc-cifor.htm</a>.</p></iframe></p>
  <!-- until here!!!! -->
<script src="app.js"></script>
</body>
</html> 
For example, how can I have the part starting at <!-- remove from here!!!! --> and going to <!-- until here!!!! --> in index2.html file and load it inside index.html?
I can copy all the relevant lines(22-78) to index2.html but how should I make it work together without using iFrame or frame...
 
     
    