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<!DOCTYPE html> <html> <body> <h1>JavaScript Operators</h1> <h2>The NOT Operator</h2> <h3>The ! Operator</h3> <p>The NOT operator returns true for a false expression and false for a true expression:</p> <p id="demo1"></p> <p id="demo2"></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>