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I am looking for a Xsl transformation free online editor. I have found w3schools TryIt Editor, but I need some more extended one. I need a tool with custom output formatting and more.
There is an open source in browser editor called CodeMirror. It doesn't hace an xsl parser, but you can add one. It does have an xml/html and an xquery parser
Check this: http://xslt.online-toolz.com/tools/xslt-transformation.php