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並前往https://www.quora.com/What-is-the-difference-between-em-rem-and-px-in-CSS

What is the difference between 'em', 'rem' and 'px' in CSS?

A pixel (px) is an absolute unit of measurement, while em and percent are relative units of measurement. When I write a style like this one: div { width: 20px; ...

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