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Validation and Testing Tools on the Web

Use these code checkers and validators to assure that your pages are standards-compliant, usable and accessible.

HTML/XHTML

CSS

Accessibility

Hyperlinks

Readability and reading level

Spelling checkers

General

Browser Compatibility

Preview a site in multiple browsers
or versions of Internet Explorer

Mobile browsers

Mobile emulators

Downloaded emulators give more realism than online simulators, but testing real devices is best.