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MCQ
What is the difference between em and rem units in responsive design?
Responsive Web Design
A em is based on parent font size; rem is based on root font size
B em is for margins; rem is for padding
C They are the same
D em is deprecated; rem is modern
Explanation

em units are relative to the parent element's font size, while rem units are relative to the root (html) element's font size, making rem more predictable for responsive designs.

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