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<!DOCTYPE html> <html> <head> <style> label { display: block; margin-top: 1em; } input[type="radio"]:checked { box-shadow: 0 0 5px 3px blue; } input[type="checkbox"]:checked { box-shadow: 0 0 5px 3px maroon; } option:checked { color: blue; background-color: pink; } </style> </head> <body> <h1>Demo of :checked</h1> <p>Select gender:</p> <label> Male</label> <label> Female</label> <label> Other</label> <p>Select transport:</p> <label>I have a bike</label> <label>I have a car</label> <p>Select favorite color:</p> <select name="color" id="color"> <option value="opt1">Red</option> <option value="opt2">Green</option> <option value="opt3">Blue</option> </select> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>