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<!DOCTYPE html> <html> <title>W3.JS</title> <script src="https://www.w3schools.com/lib/w3.js"></script> <body> <p>Click the button to hide all elements in this document.</p> <button onclick="w3.hide('*')">Hide</button> <h2>This is a heading</h2> <p>This is a paragraph.</p> <p>This is another paragraph.</p> </body> </html>
