HTML and CSS Certification Practice Test 2025 – The All-in-One Guide to Master Your Certification!

The 'visibility' property in CSS is used to control the visibility of an element on a webpage. When you set this property to 'visible,' the element is displayed normally; when set to 'hidden,' the element is not visible, but it still occupies space in the document's layout. This means that even when an element is not visible, the layout is maintained, preventing other elements from shifting or adjusting their positions as they would if the element were completely removed from the layout.

This functionality makes the 'visibility' property particularly useful when you want to toggle the visibility of elements without altering the overall layout. For example, you could use this property to show or hide menus or pop-ups while keeping their placements consistent.

In contrast, other options presented suggest different behaviors that either imply complete removal from the layout or altering the element's opacity, which are not characteristic of the 'visibility' property. Understanding the nuances of how 'visibility' operates is crucial for effectively managing element display in CSS.