You can edit / change the code and click run button <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>has demo</title> <style> .sample { border: 3px inset blue; } </style> <script src="../../../jquery-1.10.2.js"></script> <script>var clicky_site_ids = clicky_site_ids || []; clicky_site_ids.push(101319977);</script><script async src="//static.getclicky.com/js"></script> <div><p>Hello in a paragraph</p></div> <div>Hello again! (with no paragraph)</div><br> <div><p>Another text with a paragraph</p></div><br> <div>Hello! (with no paragraph)</div><br> <script> $( "div:has(p)" ).addClass( "sample" ); </script>