Understanding the :focus Pseudo-Class
The :focus pseudo-class in CSS applies styles to an element when it receives focus. This typically occurs when a user clicks on an input field, navigates to a button using the keyboard, or interacts with any focusable element. It provides visual feedback indicating that the element is active and ready for interaction.
In this example, when the input field or button receives focus, its border and shadow change, providing a clear visual indicator of focus.
Use
:focusto provide clear visual feedback for keyboard and accessibility users.Avoid removing focus indicators entirely; if customizing, ensure a visible alternative exists.
Combine with
:hoverand:activefor consistent interactive styling.Test focus styles across browsers and devices to ensure accessibility compliance.