W3School TIY Editor
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<html> <head> <script type="text/javascript" src="/example/xdom/loadxmldoc.js"> </script> </head> <body> <script type="text/javascript"> xmlDoc=loadXMLDoc("/example/xdom/books.xml"); x=xmlDoc.getElementsByTagName("title"); for (i=0;i<x.length;i++) { newatt=xmlDoc.createAttribute("edition"); newatt.value="first"; x[i].setAttributeNode(newatt); } //Output all "edition" attribute values for (i=0;i<x.length;i++) { document.write(x[i].childNodes[0].nodeValue); document.write(" - Edition: "); document.write(x[i].getAttribute("edition")); document.write("<br />"); } </script> </body> </html>