• HTML5
    http://www.w3.org/TR/html5/
    This specification defines the 5th major revision of the core language of the World Wide Web: the Hypertext Markup Language (HTML).
  • HTML 4.01 Specification
    http://www.w3.org/TR/html4/
    specification defines the HyperText Markup Language (HTML), the publishing language of the World Wide Web
  • HTML Tutorial - w3schools
    http://www.w3schools.com/html/
    This HTML tutorial contains hundreds of HTML examples.With our online HTML editor, you can edit the HTML, and click on a button to view the result.
  • HTML5 Doctor
    http://html5doctor.com/
    articles relating to HTML5, its semantics, and how to use it.
  • PageSpeed Insights
    https://developers.google.com/speed/pagespeed/insights/
    The PageSpeed tools analyze and optimize your site following web best practices.
  • The W3C Markup Validation Service
    http://validator.w3.org/
    W3C's easy-to-use HTML validation service, based on an SGML parser.
  • Webdesignérův průvodce po HTML5 - Zdroják
    https://www.zdrojak.cz/serialy/webdesigneruv-pruvodce-po-html5/
    Podrobněji a spíš z praktického hlediska, tedy „co můžeme začít používat a k čemu je to dobré“."
  • WebPagetest - Website Performance and Optimization Test
    https://www.webpagetest.org/
    Run a free website speed test from around the globe using real browsers at consumer connection speeds with detailed optimization recommendations.