Salesforce JavaScript Developer Practice Exam 2025 – 400 Free Practice Questions to Pass the Exam

To attach a CSS file to a Lightning Web Component, the correct approach is to create a CSS file with the same name as the component and place it in the same directory. This method is essential for proper encapsulation and styling within the Lightning framework.

When you create a CSS file that shares the same name as your Lightning Web Component and place it in the same directory, the Salesforce platform automatically associates that CSS file with the component. This ensures that the styles defined in the CSS file apply specifically to that component without affecting other components, leveraging the encapsulated nature of Lightning Web Components.

Unlike other methods, such as linking or importing stylesheets through JavaScript or embedding them directly in the JavaScript file, the correct approach maintains a clear organization of styles alongside their respective components, promoting better maintainability and fewer chances for style conflicts. This encapsulation is a key principle in the design of Lightning Web Components, ensuring that components are modular and reusable without unintended style leaks.