Web Reference: Learn how to perform event handling in JavaScript including HTML Event Handler attributes, DOM Level 0 Event Handlers, and DOM Level 2 Event Handlers. When an event occur, you can use a JavaScript event handler (or an event listener) to detect them and perform specific task or set of tasks. An event handler is JavaScript code that runs when an event happens. Event handlers can be used to handle and verify user input, user actions, and browser actions:
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