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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

     About the Markup Validator Help me! I clicked on an icon and...

   • 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...

2. www.w3schools.com › js › js_validationJavaScript Form Validation - W3Schools

   www.w3schools.com › js › js_validation

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   JavaScript Form Validation. HTML form validation can be done by JavaScript. If a form field (fname) is empty, this function alerts a message, and returns false, to prevent the form from being submitted: JavaScript Example. function validateForm () { let x = document.forms["myForm"] ["fname"].value; if (x == "") { alert ("Name must be filled out");

3. codebeautify.org › jsvalidateBest JavaScript Validator Online - Code Beautify

   codebeautify.org › jsvalidate

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   Javascript Validator is easy to use tool to validate JavaScript code. Copy, Paste and Validate JavaScript. This JS linter checks the js code and highlights errors as well as shows the detail of the error in a plain and easy-to-read gradient table.

4. www.w3schools.com › js › js_validation_apiJavaScript Form Validation - W3Schools

   www.w3schools.com › js › js_validation_api

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   Validity Properties. The validity property of an input element contains a number of properties related to the validity of data: Set to true, if a custom validity message is set. Set to true, if an element's value does not match its pattern attribute. Set to true, if an element's value is greater than its max attribute.

5. validatejavascript.comValidateJavaScript - Online Tool to Find & Fix JavaScript Errors

   validatejavascript.com

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   ValidateJavaScript is an online validating (or linting) tool that will automatically find basic errors and help prevent potentially destructive bugs in JavaScript and JSX (React.js) code.

6. dev.w3.org › validator › htdocsDocumentation for the W3C Markup Validator

   dev.w3.org › validator › htdocs

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   Use the validator from your applications with the experimental Markup Validator Web service, and its open API. Developer Information. Information for programmers wanting to play with the validator's code, and/or contribute to its development. SGML, Validation and the Markup Validator.

7. stackoverflow.com › questions › 20302686javascript - How to use the w3c validator API - Stack Overflow

   stackoverflow.com › questions › 20302686

   30 lis 2013 · W3C has an API for their html validator (see http://validator.w3.org/docs/api.html). But I am confused as to how it is used. I would like to be able to call this as Ajax in jquery and have the information from the validator passed back to me in a variable. How can I go about doing this? Thanks