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<!DOCTYPE html> <html> <body> Checkbox: <p>Click the "Try it" button to find out if the checkbox must be checked before submitting the form.</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>