To change the font family and font size with jQuery, use the jQuery css() method. The css property font-family and font-size is used. You can try to run the following code to learn how to change font family and font size with jQuery −
<!DOCTYPE html> <html> <head> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script> <script> $(document).ready(function() { $("p").on({ mouseenter: function() { $(this).css({"font-family": "Arial, Helvetica, sans-serif", "font-size": "200%"}); } }); }); </script> </head> <body> <p>Move the mouse pointer on the text to change the font family and size.</p> </body> </html>