Typography
大写字高
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定义
从基线到平顶大写字母(如'H'或'I')顶部的排版高度测量值,以字体em框的比例表示。
解释
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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