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Recommendations

• HTML 5.2, W3C Recommendation, 14 December 2017 (W3C)
• Cascading Style Sheets - home page (W3C)
• Extensible Markup Language (XML) 1.0 (Fifth Edition)
• Rendering Recommendation HTML 5
• Liste der Selektoren CSS 2.1
• Liste der Selektoren CSS 3

Tutorials

• w3schools - HTML
• w3schools - CSS
• w3schools - JavaScript
• ZenGarden

Hilfsmittel

• Entity Cheat Sheet - Unicode
• Normalize.css
• Chromium Browser Stylesheet
• Browser, Marktanteile