Which of the following statements is true regarding the CSS rule: div { width: 80%; } @media print { div { width: 25%; } }?

The statement that the div elements will have a width of 25% only when the page is printed is true because of how CSS media queries work. In the provided CSS rule, the first declaration establishes that the div elements will normally take up 80% of their parent container's width in a standard display context. However, the media query specifically targets the print media type, allowing you to customize the styling of elements when the page is being printed.

Within the media query, the rule indicates that for printed versions of the page, the width of the div elements will change to 25%. This means that when a user initiates a print action for the webpage, the styled output will reflect this reduced width, accommodating the typical format requirements for printed materials. Thus, the correct understanding is that the change to 25% width occurs strictly in a print context, while the default rule of 80% applies during regular viewing of the webpage.

The other choices misunderstand the function of the media query or the default styling. Some suggest that the div elements' visibility or the width only applies in situations where printing takes place, rather than as a modification to the existing layout defined outside of print conditions. Thus, it is important to recognize how media queries selectively apply