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<!DOCTYPE html> <html> <head> <script src="/lib/jquery-1.12.2.min.js"></script> <script> $(document).ready(function(){ $("p").add(document.getElementsByTagName("span")[0]).css("background-color", "yellow"); }); </script> </head> <body> <p>A p element.</p> <p>Another p element.</p> <span>A span element.</span> <span>A span element.</span><br><br> <div>This example adds the same css style for the first span element (index 0), as the existing p elements.</div> </body> </html>