Typography
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定義
フラットな大文字（「H」や「I」など）のベースラインから上端までの高さを示す活字測定で、フォントのemスクエアに対する割合で表される。
解説
Cap height typically ranges from 60% to 75% of a typeface's point size; a 16 pt font might have a cap height of around 11 pt. Designers use cap height to align mixed-size text optically and to size icons or small caps that should visually match capital letters. In CSS, the 'cap' unit (supported in modern browsers) directly references this value, enabling precise text-relative sizing.
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