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The W3C CSS Validation Service. The W3C Markup Validation Service. HTML_CodeSniffer. Check that your HTML code conforms to your coding standard HTML_CodeSniffer is a client-side script that checks HTML source code and detects violations of a defined coding standard. HTML_CodeSniffer is written entirely in JavaScript, does not require any server-side processing and can be extended by developers to enforce custom coding standards by creating your own "sniffs".

To get you started, HTML_CodeSniffer comes with standards that enforce the three conformance levels of the Web Content Accessibility Guidelines (WCAG) 2.0, and the web-related components of the U.S. "Section 508" legislation. An auditor interface is provided by a bookmarklet to let you try out these accessibility checks on any web page. WCAG 2.0/Section 508 Bookmarklet Issues detected by the bookmarklet: HTML_CodeSniffer Get the Accessibility Auditor Bookmarklet Drag this link to your bookmarks bar to install This bookmarklet has been designed to work with Google Chrome, Firefox 10+, Safari 5+ and Internet Explorer 8+

JSHint, a JavaScript Code Quality Tool. Mobile phone emulator (by COWEMO)