index.html

By default, Cordova starts the app by serving the homepage /www/index.html. (We can change it to another file in config.xml.)

Erasing all the comments, /www/index.html originally looks like this. You will need to keep the 'cordova.js' script to use Cordova.
<!DOCTYPE html><html>
  <head>    <meta http-equiv="Content-Security-Policy" 
               content="default-src 'self' data: 
                          gap: https://ssl.gstatic.com 'unsafe-eval'; 
                          style-src 'self' 'unsafe-inline'; media-src *; 
                          img-src 'self' data: content:;">        <meta name="format-detection" 
                   content="telephone=no">        <meta name="msapplication-tap-highlight" 
                   content="no">        <meta name="viewport" 
                   content="initial-scale=1, width=device-width, 
                                 viewport-fit=cover">        <link rel="stylesheet" type="text/css" 
                href="css/index.css">        <title>Hello World</title>    </head>    <body>        <div class="app">          <h1>Apache Cordova</h1>          <div id="deviceready" class="blink">          <p class="event listening">Connecting to Device</p>            <p class="event received">Device is Ready</p>        </div>      </div>    <script type="text/javascript" src="cordova.js"></script>    <script type="text/javascript" src="js/index.js"></script>  </body></html>

Refer to 2.5.5 and 2.1.2 for information on how to use the 'Content-Security-Policy' and 'viewport' <meta> tags.