When will the browser invoke the event handler?Chọn đáp án đúng:Program beginsAny event occursSpecified event occursWebpage loads

To understand when the browser invokes an event handler, let's clarify what an event handler is and the contexts in which it gets triggered.

1. Program begins: This is not accurate because the event handler does not execute just because the program starts; it needs a specific event to trigger it.

2. Any event occurs: This is overly broad, as not all events necessarily invoke every event handler. Each handler is associated with a particular event type.

3. Specified event occurs: This is the most accurate answer. Each event handler is designed to respond to a specific event (like a click, mouse movement, or keypress).

4. Webpage loads: While some event handlers can be registered to run as the webpage loads (like DOMContentLoaded), this option does not encompass all event handlers.

Final Answer

The correct answer is: Specified event occurs.