Richard Smith highlighted An e... from CSS: The Missing Manual, 2nd Edition

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An em is a unit of measurement that's based on a browser's normal text size

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Cover of CSS: The Missing Manual, 2nd Edition

2. Creating Styles and Style Sheets
from CSS: The Missing Manual, 2nd Edition
by David Sawyer McFarland
Publisher: O'Reilly Media, Inc.
Released: August 2009

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