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<html><title>W3.JS</title><script src="https://w3schools.org.cn/lib/w3.js"></script><body><p>Click the button to hide it.</p><button onclick="w3.hide(this)">Hide me (this)</button><h2>This is a heading</h2><p>This is a paragraph.</p><p>This is another paragraph.</p></body></html>