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“Bounce” (BNCE in CSS) is an axis found in some variable fonts that can be used to reposition letterforms vertically, away from the baseline, creating a more handwritten or organic style.

The Google Fonts CSS v2 API defines the axis as:

Default: Min: Max: Step:
0 -100 100 1
![The letters “sha” shown three times, with the central instance showing a default baseline position and the axis range shown below it at a default value of 50%, and then to the left with “s” below the baseline and “a” above, with the axis value shown decreased to 0%, and then to the right with “s” above the baseline and “a” below, with the axis value shown increased to 95%.](images/thumbnail.svg)
Typeface: Shantell Sans

How the letters bounce will relate to each typeface's needs or concept. For example, in Shantell Sans, adjusting the axis to its minimum value shifts the “s” character down, but the “a” character up; the “h” character moves only slightly in each direction. This semi-unpredictable behaviour results in the type appearing more like handwriting, and the effect can be further exaggerated by manipulating other axes (in the case of Shantell Sans, Informality (INFM) and Spacing (SPAC) in tandem.