W3C XHTML Validation Service
Programming web-based applications can be complex, and XHTML documents must be written correctly to ensure that browsers process them properly. To promote correctly written documents, the World Wide Web Consortium (W3C) provides a validation ser-vice (validator.w3.org) for checking a document’s syntax. Documents can be validated by providing a URL that specifies the file’s location, by uploading a file to validator.w3.org/file-upload.html or by pasting code directly into a text area. Uploading a file copies the file from the user’s computer to another computer on the Internet. The W3C’s web page indicates that the service name is MarkUp Validation Service and that the validation service is able to validate the syntax of XHTML documents. All the XHTML examples in this book have been validated successfully using validator.w3.org.
By clicking Choose…, users can select files on their own computers for
upload. After selecting a file, clicking the Check button uploads and validates
the file. If a document con-tains syntax errors, the validation service
displays error messages describing the errors.
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