Salesforce JavaScript Developer Practice Exam 2026 – Comprehensive Test Prep

Event handling in JavaScript is fundamentally about responding to various user interactions or changes within a web application. This includes actions such as clicks, mouse movements, keyboard entries, and more. When these events occur, JavaScript can trigger specific functions or behaviors to enhance user experience and provide dynamic feedback. For example, when a user clicks a button, an event handler can execute a function that displays a message or updates content on the page, thereby allowing the application to react in real-time to user inputs.

The other options do touch on important aspects of web development. Creating and modifying web pages dynamically is an important concept, but it focuses more on the broader capabilities of JavaScript beyond just event handling. Styling web applications using CSS is completely separate from event handling as it pertains to the presentation layer rather than interaction. Executing asynchronous JavaScript code is related to managing tasks that happen outside the main execution flow (like API calls) but does not directly encompass the concept of event handling itself. Hence, the key aspect of event handling lies in the capability of JavaScript to respond actively to user-generated events.