Tryit Editor v1.8

Source Code:
<!DOCTYPE html> <html> <head> <script src="../../ajax.googleapis.com/ajax/libs/jquery/1.10.2/jquery.min.js"> </script> <script> $(document).ready(function(){ $("button").click(function(){ var btn = $(this).text(); $("p").css("background-color","white"); $("p" + btn).css("background-color","yellow"); }); }); </script> </head> <body> <h1>This is a heading in body</h1> <p>The first paragraph in body.</p> <p>The second paragraph in body.</p> <div style="border:1px solid;"> <span>This is a span element in div</span> <p>The first paragraph in div.</p> <p>The second paragraph in div.</p> <p>The third paragraph in div.</p> <p>The last paragraph in div.</p> <span>This is a span element in div</span> </div><br> <div style="border:1px solid;"> <p>The first paragraph in another div.</p> <p>The second paragraph in another div.</p> <p>The last paragraph in another div.</p> </div> <p>The last paragraph in body.</p> <button>:nth-child(2)</button> <button>:nth-last-child(2)</button> <button>:nth-of-type(2)</button> <button>:nth-last-of-type(2)</button> </body> </html>
Result:
W3Schools.com - Try it yourself