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High-quality typesetting generally prefers text figures in body text: they integrate better with lowercase letters and small capitals, and their greater variety of shape facilitates reading. They help accomplish consistent typographic colour in blocks of text, unlike runs of lining figures, which can distract the eye. (Such a distraction may be desired when numbers are to stand out, for example in scientific text.) Lining figures are called for in all-capitals settings (hence the alternative name titling figures), and may work better in tables and spreadsheets.
why are the numbers different sizes when you type posts but all the same size everywhere else?