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Hanging punctuation or exdentation is a way of typesetting punctuation marks and bullet points, most commonly quotation marks and hyphens, so that they do not disrupt the ‘flow’ of a body of text or ‘break’ the margin of alignment. It is so called because the punctuation appears to ‘hang’ in the margin of the text, and is not incorporated into the block or column of text. It is commonly used when text is fully justified.
The style was used by Gutenberg in the Gutenberg Bible, the first book printed in Europe.
Very few desktop publishing applications allow for automatic hanging punctuation. This often requires manual intervention by the designer or typographer, or the use of drawing software which supports this feature, or the use of sophisticated typesetting tools. PdfTeX, a variant of the TeX typesetting program, has microtypographic capabilities that allow for semi-automatic hanging punctuation. Arbortext APP (formerly 3B2), QuarkXPress, Adobe InDesign and Corel Ventura are desktop publishing applications which offer automatic support for hanging punctuation. A related concept is optical margin alignment; letters such as W are set slightly into the margin to create an illusion of balance of white space.
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