Favicons are shown for example in the browser's address bar, bookmark list, or tabs. They enable users to quickly identify and recognize websites.

The following code: 

<head>                                                                  <!-- Non-Compliant -->
  <title>...<title>
</head>

should be refactored into: 

<head>                                                                  <!-- Compliant -->
  <title>...<title>
  <link rel="shortcut icon" href="http://example.com/myicon.ico" />
</head>