xxxxxxxxxx<html lang="en"><head><meta charset="utf-8"><title>jQuery Select Element by Class</title><script src="https://code.jquery.com/jquery-3.5.1.min.js"></script><script>$(document).ready(function(){ // Highlight elements with class mark $(".mark").css("background", "yellow");});</script></head><body> <p class="mark">This is a paragraph.</p> <p class="mark">This is another paragraph.</p> <p>This is one more paragraph.</p></body></html>