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Thanks a lot leakim971! Exactly what I was looking for!
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Thanks a lot leakim971! Exactly what I was looking for!

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If I would like to make educational web pages to teach HTML, CSS and JS like they do in W3School and Codecademy where the page is divided and you write your HTML code to the left, and immediately see the result on the right, is there any JS-library, framework, etc that could be used so that you do not have to code everything from scratch?
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If I would like to make educational web pages to teach HTML, CSS and JS like they do in W3School and Codecademy where the page is divided and you write your HTML code to the left, and immediately see the result on the right, is there any JS-library, framework, etc that could be used so that you do not have to code everything from scratch?

How to make interactive HTML code pages like w3school or Codecademy?

Cascading Style Sheets (CSS) is a language used for describing the look and formatting of a document written in a markup language. Usually used to change web pages and user interfaces written in HTML, it can also be applied to any kind of XML document. CSS is designed primarily to distinguish the content of a document from its presentation.

HTML (HyperText Markup Language) is the main markup language for creating web pages and other information to be displayed in a web browser, providing both the structure and content for what is sent from a web server through the use of tags. The current implementation of the HTML specification is HTML5.

HTML

JavaScript is a dynamic, object-based language commonly used for client-side scripting in web browsers. Recently, server side JavaScript frameworks have also emerged. JavaScript runs on nearly every operating system and  in almost every mainstream web browser.