CSS Outline
CSS Outline is a property used to draw a line around elements, outside the border edge, to make them stand out visually. It does not take up space in the layout, meaning it does not affect the element's dimensions or position, unlike borders. Outlines are commonly used for accessibility purposes, such as indicating focus states for keyboard navigation.
Developers should learn CSS Outline to enhance accessibility by providing clear visual indicators for focused elements, which is crucial for users who rely on keyboards or screen readers. It is also useful for debugging layouts, as outlines can be temporarily applied to elements without disrupting the page flow. Use cases include styling focus states for buttons, links, and form inputs to meet WCAG guidelines.