How do you create a CSS tooltip?

Creating a CSS tooltip typically involves using the :hover pseudoclass combined with a pseudo-element like ::after to display additional information when a user hovers over an element.

The :hover pseudoclass allows you to define styles that are applied when the user hovers the mouse pointer over an element. When combined with the ::after pseudo-element, you can generate content that appears after the selected element, which serves as the tooltip. This setup allows for a seamless way to show and hide the tooltip without needing to modify the HTML structure significantly.

In this context, the tooltip can be styled extensively using CSS properties, such as background color, text color, padding, border, and positioning, to create an attractive and functional design.

The other choices do not provide a valid or complete method for creating a tooltip. The :focus pseudoclass is used for keyboard interactions, which does not specifically target the hover effect necessary for a tooltip. Using the ::before pseudo-element alone might not function correctly, as it does not support displaying content triggered by hover in the same way that ::after does. Simply adding a tooltip attribute in HTML lacks the interactive styling and functionality that CSS provides, making it insufficient for creating a visual tooltip.