in other browsers. The only way to ensure that pages always display as intended is to test them in all browsers expected to render them correctly. CSS validation While the W3C and other HTML and XHTML validators will assess pages coded in those formats, a separate validator like the W3C CSS validator can check that there are no errors in the associated Cascading Style Sheet. CSS validators apply current CSS standards to referenced CSS documents. See also HTML Tidy, an offline markup validation program developed by Dave Raggett of W3C CSE HTML Validator, an offline HTML and CSS validator World Wide Web Consortium (W3C) References External links The W3C Markup Validation Service The W3C CSS Validation Service The W3C Monitoring Service Web design World Wide Web Consortium