Which of the following event occurs when user moves the mouse over an HTML element?

When a user moves the mouse over an HTML element, the event that occurs is the mouseover event. This event is triggered whenever the cursor enters the bounding box of the HTML element.

In addition, if the cursor moves out of the element, the mouseout event is triggered. These events are often used in web development to create interactive user interfaces, such as highlighting elements, displaying tooltips, or changing styles.

You can handle these events in JavaScript to provide a dynamic experience for users. For example, you can use the following code snippet:

element.addEventListener('mouseover', function() {
    // Code to execute when mouse enters the element
});
element.addEventListener('mouseout', function() {
    // Code to execute when mouse leaves the element
});

Overall, the mouseover event is a fundamental aspect of creating engaging and user-friendly web applications.