Which CSS3 property defines whether a transformed element is visible when it is rotated away from the viewer?

Which CSS3 property defines whether a transformed element is visible when it is rotated away from the viewer?

• A. perspective
• B. transform
• C. backface-visibility
• D. rotate

Answer: (C)

When you rotate an element in 3D, you may want to hide the side that faces away from the viewer. The property that controls this is backface-visibility. It determines whether the back face of the element is drawn when it’s turned away. Setting it to hidden makes the backside disappear as the element rotates, which is essential for clean 3D flip effects. Perspective changes how deep the scene feels but doesn’t decide whether the back is shown. Transform is the container for the transformation actions, and rotate is just one of those actions; neither directly governs whether the far side is visible.