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Font linking
Unlike font fallback, in which the selected font is internally replaced by a predefined font, in font linking (also called “composite fonts”) it is possible to link one or more fonts (called «linked fonts») to another font (called the «base font»). Once you link fonts, you can use the base font to display code points that do not exist in the base font, but do exist in one of the linked fonts. For example, linking a Hangeul font and a Japanese font to a Tahoma font allows you to display both Korean and Japanese characters while specifying Tahoma font. The Noto family of fonts uses the model to create what appears as a single font by combing script-specific font files.
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