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<html><body><p>Click the button to wait 3 seconds, then alert "Hello".</p><p>After clicking away the alert box, an new alert box will appear in 3 seconds. This goes on forever...</p><button onclick="myFunction()">Try it</button><script>var myVar;function myFunction() { myVar = setInterval(alertFunc, 3000);}function alertFunc() { alert("Hello!");}</script></body></html>