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LEADING. The space between lines of typography has been called leading since the days when typesetters and printers inserted thick strips of lead in between sentence lines during hot metal typesetting. Designers and copywriters denote font size and leading in what looks similar to a fraction: 12/16 means 12-point type size with 16-point leading.

Today, software enables instantaneous and precise adjustment of leading by toggling points and pixels up or down, to the most precise fraction, such as 11.01 points. Most software sets type with approximately 120 percent of leading, making a 12-point font have 14.4 points of leading. But that is not always the ideal calculation; so don’t settle for the default. For improved readability, a general ...

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