abs() exists with cross-browser support: https://developer.mozilla.org/en-US/docs/Web/CSS/abs https://developer.mozilla.org/en-US/docs/Web/CSS/abs There are a

abs() exists with cross-browser support: https://developer.mozilla.org/en-US/docs/Web/CSS/abs https://developer.mozilla.org/en-US/docs/Web/CSS/abs There are also other non-custom math functions like round() which can be very useful.