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<html><head><script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/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>