HTML Validation for:
Testing for valid HTML checks the code for any errors according to W3C Recommendations.. Valid html is error free, providing the same look on many web browsers.
CSS Validation for:
If using cascading stylesheets, be sure to check for validness with the W3C standards as well. Valid CSS is also error free and provides styling that many web browsers render properly.
Section 508 Validation for:
Section 508 Guidelines require webpages to be accessible to all users, including disabled users. Test the page for validness with Section 508.
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