What does the CSS property 'display: none;' do to an element?

The CSS property 'display: none;' effectively removes the element from the document flow entirely. This means that the element is no longer rendered on the page, and it does not take up any space where it might have been positioned.

When an element has 'display: none;' applied, it is as if the element does not exist in the layout, so surrounding elements will shift into the space where the hidden element would normally be. This property is particularly useful for controlling visibility without affecting the layout or flow of other elements on the page.

In contrast, other options suggest different behavior that does not align with what 'display: none;' achieves. For example, hiding an element but retaining its space contradicts the very purpose of using this specific display property. Similarly, the properties of changing the size of the element or conditioning visibility on hover describe features that are not applicable to the 'display: none;' setting.