Überblick
MDN Web Docs bietet eine umfassende Dokumentation zu HTML, CSS und APIs für Webseiten und progressive Web Apps 1. W3Schools bietet kostenlose Online-Tutorials, Referenzen und Übungen in allen großen Programmiersprachen der Webentwicklung, darunter HTML, CSS, JavaScript, Python, SQL, Java und viele mehr 2.
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developer.mozilla.org
MDN Web Docs
The MDN Web Docs site provides information about Open Web technologies including HTML, CSS, and APIs for both Web sites and progressive web apps.
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w3schools.com
W3Schools Online Web Tutorials
W3Schools offers free online tutorials, references and exercises in all the major languages of the web. Covering popular subjects like HTML, CSS, JavaScript, Python, SQL, Java, and many, many more.
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w3.org
W3C
The World Wide Web Consortium (W3C) develops standards and guidelines to help everyone build a web based on the principles of accessibility, internationalization, privacy and security.