Difficulty: Hard

Average Score: 37%

Given the following CSS3 style: @keyframes image { from {opacity: 0.0;} to {opacity: 1.0;} } img { animation-name: image; animation-duration: 5s; }

How do images on the page appear after the page loads?

Rationale

Images on the page start invisible and then gradually appear over a five-second interval.

The CSS3 style provided uses keyframes to animate the opacity of images from 0.0 to 1.0, which means the images will become visible over the duration of five seconds after the page loads.

A (Invisible, and then they appear immediately after five seconds) YOUR ANSWER

This choice incorrectly suggests that the images remain invisible for the full five seconds and then suddenly appear. The animation defined in the keyframes indicates a gradual transition, not an immediate appearance.

B (Visible, and then they disappear immediately after five seconds) YOUR ANSWER

This option contradicts the animation setup as it implies that the images are initially visible and then disappear right away. The provided keyframes do not support this scenario, as the animation starts with the images being invisible.

C (Visible, and then they gradually disappear over a five-second interval) YOUR ANSWER

This choice misinterprets the animation direction. The images are not initially visible; they start from opacity 0.0 and gradually increase to opacity 1.0 over the five seconds. Therefore, they do not disappear but rather become visible.

D (Invisible, and then they gradually appear over a five-second interval) CORRECT

This option accurately describes the animation effect defined in the CSS. The images are initially set to be invisible (opacity 0.0) and gradually transition to being fully visible (opacity 1.0) over a span of five seconds.

Conclusion

The CSS animation specified in the question illustrates a gradual increase in visibility for images from invisible to fully visible over a five-second period. Understanding the keyframes and their impact on opacity clarifies that choice D correctly depicts the intended behavior of the images on the page after loading.

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