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1. validator.w3.orgThe W3C Markup Validation Service

   validator.w3.org

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   This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc. If you wish to validate specific content such as RSS/Atom feeds or CSS stylesheets, MobileOK content, or to find broken links, there are other validators and tools available.

   • Docs

     W3C's easy-to-use markup validation service, based on SGML...

   • About

     About this service. The Markup Validator is a free service...

   • non-DTD-based Validator

     Chętnie wyświetlilibyśmy opis, ale witryna, którą oglądasz,...

   • Help FAQ

     The Markup Validator is a free tool and service that...

   • News

     0.8.4 may sound like a very minor step from the version...

   • MobileOK Content

     Be mobile friendly. The Mobile Checker is a tool for Web...

   • W3C RDF Validation Service

     Check and Visualize your RDF documents. olde servlet. Enter...

   • CSS Validator

     CSS Validation Service. Check Cascading Style Sheets (CSS)...

2. jigsaw.w3.org › css-validatorThe W3C CSS Validation Service

   jigsaw.w3.org › css-validator

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   CSS Validation Service. Check Cascading Style Sheets (CSS) and (X)HTML documents with style sheets. Note: If you want to validate your CSS style sheet embedded in an (X)HTML document, you should first check that the (X)HTML you use is valid.

3. www.w3schools.com › w3css › w3css_validationW3.CSS Validation - W3Schools

   www.w3schools.com › w3css › w3css_validation

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   The W3C CSS Validator checks for CSS1, CSS2, CSS3, and CSS4 properties. Some browsers use vendor extensions to simulate CSS3 and CSS4 properties. Vendor extensions can create warnings in the W3 CSS validation prosess.

4. jigsaw.w3.org › css-validator › manualInstrukcja dla użytkownika walidatora CSS - W3

   jigsaw.w3.org › css-validator › manual

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   Poniżej zamieszczono tabelę parametrów, które można wykorzystać przy wysyłaniu polecenia do walidatora CSS W3C. Jeśli chcesz skorzystać z publicznego serwera walidacyjnego W3C, użyj poniższych parametrów razem z następującym URI: http://jigsaw.w3.org/css-validator/validator

5. www.w3.org › wiki › CssValidatorCssValidator - W3C Wiki - World Wide Web Consortium (W3C)

   www.w3.org › wiki › CssValidator

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   15 lut 2023 · The CSS validator is translated in more than 10 languages. The translation kit contains instructions for translation, as well as two types of files: static documentation (HTML, encoded as utf-8) pages. a properties (text) file listing the terms used in the validator, and their value in english, to be translated.

6. jigsaw.w3.org › css-validator › manualCSS Validator User Manual - W3

   jigsaw.w3.org › css-validator › manual

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   How to use the CSS Validator. The simplest way to check a document is to use the basic interface. In this page you will find three forms corresponding to three possibilities: Validation by URL. Simply enter the URL of the document you want to validate. This document can be HTML or CSS one. Validation by file upload

7. validator.w3.org › docs › helpHelp for The W3C Markup Validation Service

   validator.w3.org › docs › help

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   The Markup Validator is a free tool and service that validates markup: in other words, it checks the syntax of Web documents, written in formats such as (X)HTML. The Validator is sort of like lint for C. It compares your HTML document to the defined syntax of HTML and reports any discrepancies.