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W3Schools
from Wikipedia   
W3Schools is a popular web site for learning web technologies online.
Content includes tutorials and references relating to HTML, CSS, JavaScript, PHP, AngularJS, SQL, Bootstrap, and jQuery. It receives more than 10 million unique visitors monthly.

Created in 1998, its name is derived from the World Wide Web, but is not affiliated with the W3C (World Wide Web Consortium).[3] It is run by Refsnes Data in Norway.[1] W3Schools presents thousands of code examples. By using an online editor, readers can edit examples and execute the code in a sandbox.

W3Schools is optimized for learning, testing, and training. Examples might be simplified to improve reading and basic understanding. Tutorials, references, and examples are constantly reviewed to avoid errors, but we cannot warrant full correctness of all content.

Amaya

from Wikipdia    Amaya

Amaya (formerly Amaya World)[4] is a discontinued free and open source WYSIWYG web authoring tool[5] with browsing abilities.

It was created by a structured editor project at the INRIA, a French national research institution, and later adopted by the World Wide Web Consortium (W3C) as their testbed for web standards;[6] a role it took over from the Arena web browser.[7][8][9] Since the last release in August 1012, INRIA and the W3C have stopped supporting the project and active development has ceased.[10][11]

Amaya has relatively low system requirements, even in comparison with other web browsers from the era of its active development period, so it has been considered a "lightweight" browser.[12]

Markup Validator

validator.w3.org

The Markup Validator is a free service by W3C that helps check the validity of Web documents.

Most Web documents are written using markup languages, such as HTML or XHTML. These languages are defined by technical specifications, which usually include a machine-readable formal grammar (and vocabulary). The act of checking a document against these constraints is called validation, and this is what the Markup Validator does.

Validating Web documents is an important step which can dramatically help improving and ensuring their quality, and it can save a lot of time and money (read more on why validating matters). Validation is, however, neither a full quality check, nor is it strictly equivalent to checking for conformance to the specification.

This validator can process documents written in most markup languages. Supported document types include the HTML (through HTML 4.01) and XHTML (1.0 and 1.1) family, MathML, SMIL and SVG (1.0 and 1.1, including the mobile profiles). The Markup Validator can also validate Web documents written with an SGML or XML DTD, provided they use a proper document type declaration.

This validator is also An HTML validating system conforming to International Standard ISO/IEC 15445—HyperText Markup Language, and International Standard ISO 8879—Standard Generalized Markup Language (SGML) – which basically means that in addition to W3C recommendations, it can validate according to these ISO standards.

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