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<!DOCTYPE html> <html> <body> <p>Click "Try it". Wait 3 seconds. Your page will alert "Hello".</p> <p>When you close the alert box, an new alert box will appear in 3 seconds.</p> <p>This will go on forever, until you close the window.</p> <button onclick="setInterval(function(){alert('Hello')},3000);">Try it</button> </body> </html>
