Adding metadata

Metadata is information about html document, that not visible for user and can be used by browsers, search engines and other web services. Element <meta> must be in head section. Closing tag can be omitted.

  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta name="description" content="some text of 150 words">
  <meta name="keywords" content="HTML,CSS,JavaScript">
  <meta name="author" content="FirstName LastName">
  <meta name="copyright" content="company name">