fontSize

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Syntax: <absolute-size> | <relative-size> | <length-percentage [0,∞]> | math

Initial value: medium

| Chrome | Firefox | Safari |  Edge  |   IE    |
| :----: | :-----: | :----: | :----: | :-----: |
|   1    |    1    |   1    |   12   |   5.5   |

See also