What is the difference between the em and rem units when setting font size in CSS?

  • em and rem are identical; there's no difference between them.
  • em is a fixed unit equivalent to 16px, while rem is relative to the parent element.
  • em is a unit of measurement for page width, while rem is for font size.
  • em is relative to the font-size of the element itself, while rem is relative to the font-size of the root element (html).
The em unit is relative to the font-size of the element itself, while the rem unit is relative to the font-size of the root element (html). This means that em units can compound if used within nested elements, whereas rem units remain consistent throughout. Understanding this difference is crucial for responsive design.
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