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When adding and event using addEventListener()
, you do not use the "on" prefix.
When doing it inline, right in the mark up as an property, you do use "on" as well as
attaching it to an object like object.on{event}
.
document.getElementById("TestButton").addEventListener("click", function(){ SayHello()});
// vs
<button type="button" id="GoodbyeButton" class="btn btn-danger" onclick="SayGoodBye()">Say Goodbye</button>