Events are represented by an event object as a member variable of the window object, such as window.event or whether as a parameter to your function

Event handlers are Javascript code that are not include inside the <script> tags, but rather, inside the html tags, that execute Javascript when some events fire, such as pressing a button, moving your mouse over a link, submitting a form, etc.

The basic syntax of these event handlers is : name_of_handler="JavaScript code here"

For example:

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onload

Displays an alert box when the page has finished loading.