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In page Typography:

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Studies of both legibility and readability have examined a wide range of factors including type size and type design, comparing serif vs. sans-serif type, roman type vs. oblique type and italic type, line length, line spacing, color contrast, the design of right-hand edge (for example, justification, straight right hand edge) vs. ragged right, and whether text is hyphenated. Justified copy must be adjusted tightly during typesetting to prevent loss of readability, something beyond the capabilities of typical personal computers.[citation needed]