Metadata

- Tags which are not visualized may serve as metadata
- titles, favicon, Keywords, Description, Author, Encoding, etc.
- Metadata are mostly found in the <head> section
- Metadata are used by search-engine
- Clean and accurate meta-data improve automatic analysis of websites (and indexation)

<!DOCTYPE html>
<html>
<head>
  <title> TITLE </title>
  <meta name="author" content="">
  <meta name="keywords" XXX >
  <meta name="description" YYY >
  <meta name="icon" ZZZ >
</head>
<body>...</body>
</html>