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<!DOCTYPE html> <html> <body> <select id="mySelect" size="5"> <option>Cat</option> <option>Dog</option> <option>Horse</option> <option>Elephant</option> <option>Mouse</option> <option>Fish</option> <option>Cow</option> </select> <p>Click the button to return the number of visible options in the dropdown list.</p> <button onclick="myFunction()">Try it</button> <p id="demo"></p> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/edibu.js"></script> <script src="https://www.comfortsoftwaregroup.com/web/webmastertoolbag/tongji.js"></script></body> </html>