A proposed standard which allows websites to define security policies.

The goal of this site is to enable you do very quickly create and maintain your own coding standard.

PHP Mess Detector rule sets files and PHP Code Sniffer rulesets are supported.

The global fetch function is an easier way to make web requests and handle responses than using an XMLHttpRequest. This polyfill is written as closely as possible to the standard Fetch specification at https://fetch.spec.whatwg.org.

North is a set of standards and best practices for developing modern web based properties. Included are standards and best practices for all aspects of a project, from kick off through development. North encourages an agile, content-first, approach to product development and a mobile-first, in-browser, system based approach to design and development.

The PHP Coding Standards Fixer tool fixes most issues in your code when you want to follow the PHP coding standards as defined in the PSR-1 and PSR-2 documents.

HTML: The Living Standard. A technical specification for Web developers.

Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.

base2 is a lightweight library that irons out all the annoying differences in JavaScript implementations. It provides the additional functionality from JavaScript 1.6+ that only Mozilla browsers implement.

A Simple Standards-Based Slide Show System

(X)HTML5 Validator

PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.

The Email Standards Project is about working with email client developers and the design community to improve web standards support and accessibility in email. The project was formed out of frustration with the inconsistent rendering of HTML emails in major email clients.

This article is for those who are new to ARIA. You need an understanding of HTML and the potential difficulties that people with disabilities can face using the Web. It is useful to be familiar with some Rich Internet Applications from a user's perspective.

These CSS bugs are all found only in Internet Explorer, versions 5 and higher. To see the demos properly, they must be viewed in IE, of course.

This checker performs various tests on a Web Page to determine its level of mobile-friendliness.

Alsacréations est une communauté dédiée à l'apprentissage des standards web (W3C, HTML, XHTML, CSS) ainsi qu'à l'accessibilité numérique

This validator checks the markup validity of Web documents in HTML, XHTML, SMIL, MathML, etc.

Web Tools for Quality, Accessibility, Standards Compliance.