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<!DOCTYPE html> <html> <head> <title>Title of the document</title> </head> <body> <h1 id="elemId">Welcome to W3Docs</h1> <script> document.addEventListener("welcome", function(event) { alert("Hi, " + event.target.tagName); // Hi H1 }); let event = new Event("welcome", { bubbles: true }); elemId.dispatchEvent(event); </script> </body> </html>