Question

1. It refers to measure of relative font size incomputer ​

Answer 1

Relative-height (or scalable) font sizes are generally used for digital documentation (i.e. web pages) and are based on a specific reference point, usually the default font size as specified in the reader's browser. They are: Ems (em) is a scalable unit, where 1em = browser default.

Answer 2

A relative measurement for the height of a font in em spaces. Because an em unit is equivalent to the size of a given font, if you assign a font to 12pt, each "em" unit would be 12pt; thus, 2em would be 24pt. This value defines a measurement relative to a font's x-height...

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