HTML Host Pages

Any HTML page containing the proper incantation can include code created with GWT, referred to as a host page. A typical HTML host page looks like this: 
 <html>
  <head>
  
    <!-- Properties can be specified to influence deferred binding -->
    <meta name='gwt:property' content='locale=en_UK'>
    
    <!-- Stylesheets are optional, but useful -->
    <link rel="stylesheet" href="Calendar.css">
    
    <!-- Titles are optional, but useful -->
    <title>Calendar App</title>
    
  </head>
  <body>
   
    <!-- The fully-qualified module name, followed by 'nocache.js' -->
    <script language="javascript" src="com.example.cal.Calendar.nocache.js"></script>
    
    <!-- Include a history iframe to enable full GWT history support -->
    <!-- (the id must be exactly as shown)                           -->
    <iframe src="javascript:''" id="__gwt_historyFrame" style="width:0;height:0;border:0"></iframe>
    
  </body>
 </html>
The structure was designed to make it easy to add GWT functionality to existing web applications with only minor changes.