W3C's easy-to-use markup validation service, based on SGML and XML parsers.
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How to check if a website is W3C compliant?
Headings outline:
1
In any browser, open the W3C HTML Validator (The W3C Markup Validation Service).
2
In the Address field, type the URI (e.g., www.w3.org).
3
Click the More Options link.
4
Select the Outline checkbox.
5
Click the Check button.
How to use W3C web validator?
Quick Start. Just type (or Cut&Paste) the URL for the page you want to validate into the text field on the form and press the "Validate this page" button. If you have a local file you want to validate, choose the "File Upload" link from the navigation menu.
How to validate a website?
The easiest way to validate a web page is to go to the address http://validator.w3.org/ and type in the page's web address in the form provided. Or upload the file or copy and paste the code in via the optional tabs on the above page.
How to validate your HTML code?
In order to validate your code, you have to declare the standard to which it adheres. To describe the HTML standard (the document type declaration, DTD), the file should contain a DOCTYPE declaration (before the HTML code). Here are a few examples (from http://www.htmlhelp.com/tools/validator/doctype.html).
Validate by URI. Enter the URI of a document (HTML with CSS or CSS only) you would like validated: Address: More Options ...
This page lists the validators and web developer tools.
May 3, 2024 · The www-validator mailing list is used to discuss the W3C Markup Validation Service, Link Checker and Log Validator.
Mar 14, 2014 · Validation is the answer! There are many tools available, from the W3C and other places, that allow you to validate the code on your sites. The ...