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In variable fonts, “axis” usually refers to a single aspect of a typeface’s design that can be altered by the user.

![Various weights of a typeface set along the top of a horizontal line. Beneath the line, on the far left, is a label of zero; on the right, 1000.](images/thumbnail.svg)

Common axes include Italic, Optical Size, Slant, Weight, and Width, all five of which are registered (defined) in the OpenType file format specification.

However, any property of a typeface’s design can be mapped to an axis—the choice is up to the type designer. Using axes is always possible in CSS via the font-variation-settings attribute, while Weight can be controlled by font-weight, Width can be controlled by font-stretch, and Optical Size is automatically applied by font-optical-sizing.