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The HTML5 Input Event

In the DOM a special event occurs on an <input> or <textarea> element known as the change event [1] [2]. The change event gives a developer the ability to catch input changes. However, it falls short when instant feedback is needed because it will only trigger once the input has lost focus. Immediate feedback could be handled using the keydown or keyup events. Those events are costly (happening often and requires the code to keep state to know of changes actually occurring) and are potentially buggy due to extra logic needed.

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