Which event occurs when a selection is modified in a <select> element?

The event that occurs when a selection is modified in a <select> element is the onchange event. This event is triggered when the user changes the selection and then moves the focus away from the select element, indicating that a selection was made and the element no longer has focus.

For example, if a user selects a different option from a dropdown menu and then clicks outside of the menu or tabs away from it, the onchange event will fire. This allows developers to execute specific actions in response to the user's selection, such as updating other parts of the webpage based on the new selection.

In contrast, the oninput event is typically associated with form elements where data is entered, such as input fields, and it triggers immediately upon input changes. The onclick event is related to mouse clicks rather than changes in selection from a dropdown. The onmodify event is not a standard event in the context of HTML and JavaScript, so it does not apply here. Thus, onchange is the correct choice for detecting modifications to a selection in a <select> element.