We extract metadata from the content of HTML metadata elements. The content of the <title> element is used for the document title, and the <meta> element can be used to specify author, subject, keywords, date, and generator application:

  <title>On 7 Languages</title>
  <meta name="author" content="Jasper Lutz"/>
  <meta name="subject" content="An exploration of 7 programming languages"/>
  <meta name="keywords" content="ruby, python, javascript, go, clojure, haskell, objective-c "/>
  <meta name="date" content="2017-08-23"/>
  <meta name="generator" content="DocRaptor.com"/>
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