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HTML Exercises Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

Python Exercises Many chapters in this tutorial end with an exercise where you can check your level of knowledge.

Examples in Each Chapter This CSS tutorial contains over 700 CSS examples. With our online editor, you can edit the CSS, and click on a button to view the result.

Click on the "Run example" button to see how it works. We recommend reading this tutorial, in the sequence listed in the left menu. C++ is an object oriented language and some concepts may …

Click on the "Run example" button to see how it works. We recommend reading this tutorial, in the sequence listed in the left menu.

The tutorial can show examples for GitHub, GitLab, or Bitbucket. The Git commands are mostly the same, but some steps (like connecting to a remote or pushing code) might look a little …

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, …

Learn JavaScript The programming language of the Web. JavaScript is easy to learn. This tutorial covers everything from basic JavaScript up to the latest 2025 version. Start learning …

XPath Standard Functions XPath includes over 200 built-in functions. There are functions for string values, numeric values, booleans, date and time comparison, node manipulation, …