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A validator is a computer program used to check the validity or syntactical correctness of a fragment of code or document. The term is commonly used in the  ...

The W3C Markup Validation Service

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 ...

The W3C CSS Validation Service - Jigsaw Demo Site

The W3C validators are hosted on server technology donated by HP, and supported by community donations. Donate and help us build better tools for a better ...

Validators | Django documentation | Django

A validator is a callable that takes a value and raises a ValidationError if it doesn't meet some criteria. Validators can be useful for re-using validation logic ...
Unlike HTML validators, accessibility validators require that you do a bit more manual work to make sure that your sites are accessible. This document will help you understand how to use an accessibility validator so that your site actually is accessible. More »

Validators - FormValidation

FormValidation comes with various built-in validators listed in ... (X)HTML5 Validator

An implementation of the HTML5 parsing algorithm in Java in the form of an online tool. Several presets and options.

An online RELAX NG validation service. Supports multiple schemas at a time.

validator - npm

A library of string validators and sanitizers. ... Install the library with npm install validator ... <script type="text/javascript" src="validator.min.js"></script>.

Validation - Laravel - The PHP Framework For Web Artisans

Manually Creating Validators; Form Request Validation. Working With Error Messages. Custom Error Messages. Available Validation Rules; Conditionally ...

Popular Q&A
Q: What Is the Test Validation Process?
A: Significance. Questions or scenarios on tests should accurately give researchers the information they need. Once the answers are obtained, an appropriate interp... Read More »
Q: How to Validate Data in Excel.
A: Instructions. Know the types of data that you can validate in an Excel spreadsheet. Numbers, dates and times and length can be limited to whole numbers, or ones... Read More »
Q: What is validate?
A: meaning validated validate (v.) To declare or make legally valid. :To mark with an indication of official sanction. :To establish the soundness of; corroborate. Read More »
Q: What is validity?
A: validity is the extent to which a test measures what it purports to measure. Read More »
Q: How to Give Valid Excuses
A: 1 Prevent needing to explain! Do your assigned task in the first place, or tell the person in charge if you know you won't be able to finish in time. Ad 2 Let t... Read More »