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<!DOCTYPE html> <html> <head> <title>HTML ontoggle attribute example</title> </head> <body> <h3>HTML ontoggle attribute example</h3> <p>Open and close the details element to trigger the event.</p> <details ontoggle="myFunction(event)"> <summary>Click to see details</summary> <p>Here are the additional details</p> </details> <script> function myFunction(e) { alert('Details: ' + e.newState); } </script> </body> </html>