Line height represents the total vertical gap separating two consecutive rows of text, calculated precisely from the baseline of the upper row to the baseline of the row directly underneath it. Historically, during the era of physical metal typesetting, this dimension accounted for the combined thickness of the character blocks themselves plus the physical strips of lead alloy (a practice known as leading) placed between the rows to separate them.
This vertical pacing exercises a monumental influence over text readability, rendering its mastery one of the absolute cornerstones of typesetting discipline.
When applying this property digitally, designers can define the spatial value using a wide variety of measurement increments just like character scaling, though the chosen units do not have to match. For example, it is perfectly standard practice to dictate the text sizing using specific pixel measurements while defining the row spacing as a fluid percentage of that size.
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