In the context of variable fonts, an axis represents a specific design attribute that can be dynamically customized by the user.
The OpenType file format specification officially registers five core axes: Italic, Optical Size, Slant, Weight, and Width. Beyond these standard options, type designers have the freedom to map virtually any visual property of a typeface to a custom axis.
In web development, developers can manipulate any available axis using the generic font-variation-settings property in CSS. Additionally, specific core axes can be controlled with more direct CSS properties: font-weight manages weight, font-stretch adjusts width, and font-optical-sizing handles the automatic optimization of optical size.
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