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<!DOCTYPE html> <html> <style> .democlass {color:red} </style> <body> <h1>HTML DOM Attributes</h1> <h2>The setNamedItem() Method </h2> <p>Set the first H1's class attribute to "democlass".</p> <script> const nodeMap = document.getElementsByTagName("H1")[0].attributes; const node = document.createAttribute("class"); node.value = "democlass"; nodeMap.setNamedItem(node); </script> </body> </html>
