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aiongg
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In vertical frames upright runs are shaped TopToBottom (vert; vkrn/vpal when asked), advance by their vertical metrics and hang from their vertical origins on the em box centre, on screen and in PDF; their line ascent and descent are the em box. Turned runs stay horizontal without vrt2 (rather than every run taking vert and vrt2), and tate-chu-yoko stays horizontal and centres on the em box, its offsets moving it along and across the line. Horizontal Kana in upright runs takes vkna. Each run is shaped with the text around it, as horizontal runs are.