= Typography
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<Typography> concerns the selection and arrangement of written forms. In digital systems, the visible result depends on several distinct operations: interpreting <text characters>, selecting <glyphs> from a <computer font>, positioning them, and converting their geometry into <pixels> through <rasterization>.
This distinction matters when a document looks wrong. Missing <glyphs>, incorrect <glyph> substitutions and poorly rendered <pixels> can produce different failures even when the underlying <Unicode> text is unchanged.<OpenType Layout Overview by Microsoft>[Characters versus glyphs and OpenType Layout terminology: abstract characters, visual glyphs, substitution and positioning]{ref}
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