Validator... Much has been made about standards compliance in modern Web browsers. Less is made about the responsibity Web authors have to deliver correct mark-up to these programs. Some HTML authors champion one browser over another for its standards support when they themselves do little or nothing to assure their mark-up is correct. Unfortunately, most validation tools operate on one file at a time through a Web or editor interface. This makes checking large numbers of files in a production environment tedious and impractical. Validator easily checks one file or a thousand. It efficiently assures all your XML is ready for your workflow.
RCREWS Thanks for the feedback. Validator is written to easily test multiple files at once. Drag the folder containing your Web site to the icon and Validator will evaluate all the XML on your site: XHTML, XSL, SVG, etc. Check out the readme for the details of what it tests, how it tests, and how it reports errors. (Version 1.4.1)
RCREWS Based on your feedback, version 1.4.1 appends a log to the report showing how many files it checked. I'm guessing you dragged a folder that did not contain any files with the recognized XML extensions. The version you reviewed shows a blank screen in this case. The readme describes how to add extensions to Validator's list of XML file name extensions. Thanks. (Version 1.4.1)