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Cap height

As explained in Everyday Data Visualization

Cap height is the height of a typeface's uppercase letters.

Cap height is the height of a typeface’s uppercase letters. At small sizes, its relationship to x-height helps determine how much white space and readability the type provides. section 5.2.1

Compare typefaces at the same cap height

Normalizing fonts to the same cap height makes their lowercase proportions easier to compare. Roboto and Museo Moderno perform well by x-height, while Futura Condensed and Brush Script MT provide less internal white space. section 5.2.1

How Everyday Data Visualization covers it

How deep it goes
Explains cap height through its relationship with x-height and white space, but does not develop typography internals.
Examples
Compares Roboto, Museo Moderno, Futura Condensed, Brush Script MT, and other fonts after normalizing their cap height.
What you can do after
Evaluate small-size typefaces by comparing uppercase height, lowercase proportions, and available internal white space.
How it connects
Connects cap height with x-height, font weight, counters, letter shape, and readability.
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This explainer was generated by Manning's knowledge graph from the text of Everyday Data Visualization. The section links point to the parts of the book it draws on.