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<!DOCTYPE html> <html> <head> <style> #myDIV { border: 1px solid black; width: 400px; height: 100px; animation: mymove 5s infinite; } @keyframes mymove { 50% {font-size: 40px;} } </style> </head> <body> <h1>Animation of font-size</h1> <p>Gradually change the font-size of the text:<p> <div id="myDIV"> <p>This is a paragraph</p> </div> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>