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

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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 …

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

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

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

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, …