A single Font file that contains a continuous range of stylistic variations along one or more design axes such as Weight, width, slant, and Optical Size, rather than requiring a separate file for each predefined instance. Introduced in the OpenType 1.8 specification (2016), variable fonts use quadratic or cubic interpolation between designer-defined master outlines to generate any intermediate value on the fly. This dramatically reduces the number of files needed to serve a full Type Family, lowers bandwidth on the web, and gives designers fine-grained, real-time control over typographic expression.
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