Which property of the event object contains the HTML element that triggered the event?event.targetevent.sourceevent.triggerevent.element

The property of the event object that contains the HTML element that triggered the event is event.target.

In the context of event handling in JavaScript, event.target refers to the specific element that is the actual source of the event. This is particularly useful when you have event listeners on parent elements and want to know which child element triggered the event.

Here’s a brief overview of the other options for clarity:

• event.source: This is not a standard property of the event object.
• event.trigger: This is also not a standard property of the event object.
• event.element: This is similarly not a standard property.

Thus, the correct choice is event.target.