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<!DOCTYPE html> <html> <title>W3.CSS</title> <meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="/w3css/5/w3.css"> <body> <div class="w3-container"> <h2>Toggle Show/Hide</h2> <p>Click on the button to show/hide a paragraph.</p> <button onclick="myFunction()" class="w3-btn w3-black">Toggle hide and show</button> <p>Paragraph 1.</p> <p id="Demo" class="w3-hide w3-red">Paragraph 2.</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>