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Typeface Family Spacing Weights/Styles Target script Included from Can be installed on Example image Aharoni [6]: Sans Serif: Proportional: Bold: Hebrew: XP, Vista
Examples of several libre, sans-serif typefaces. There are Unicode typefaces which are open-source and designed to contain glyphs of all Unicode characters, or at least a broad selection of Unicode scripts. There are also numerous projects aimed at providing only a certain script, such as the Arabeyes Arabic font.
Font substitution is the process of using one typeface in place of another when the intended typeface either is not available or does not contain glyphs for the required characters. Font substitution can be aided by: classifying fonts into generic font families, such that for example a sans serif font is substituted by another sans serif font.
This table gives a comparison of the file formats each program can export or save. In some cases, omitting an export format ( Microsoft Word 's omission of WordPerfect export is the best known example) was a sales rather than a technical measure.
Font embedding is a controversial practice because it allows copyrighted fonts to be freely distributed. The controversy can be mitigated by only embedding the characters required to view the document (subsetting). This reduces file size but prohibits adding previously unused characters to the document.
Fonts which support a wide range of Unicode scripts and Unicode symbols are sometimes referred to as "pan-Unicode fonts", although as the maximum number of glyphs that can be defined in a TrueType font is restricted to 65,535, it is not possible for a single font to provide individual glyphs for all defined Unicode characters (154,998 ...
Such a format is useful for distributing an entire typeface (font family) in just one file. By combining related fonts into a single file, font tables that are identical can be shared, thereby allowing for more efficient storage. Also, individual fonts have a glyph-count limit of 65,535 glyphs, and a Collection file provides a "gap mode ...
Three systems are in common use: OpenType, devised by Microsoft and Adobe, Apple's Apple Advanced Typography (AAT), and SIL's Graphite. The lists below provide information about OpenType and AAT features. Graphite does not have a fixed set of features; instead it provides a way for fonts to define their own features.