<html><head><script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script><script>$(document).ready(function(){ $("button").click(function(){ $("p").removeAttr("id class"); });});</script><style>#p1 { color: white; background-color: green; font-size: 20px; padding: 5px; }.blue { color: white; background-color: blue; font-size: 20px; padding: 5px; }</style></head><body><h1>This is a heading</h1><p id="p1">This is a paragraph.</p><p class="blue">This is another paragraph.</p><button>Remove id and class attribute from all p elements</button></body></html>