Blink and WebKit are less sexy and use tetrasexagesimal a.k.a. 1/64 (https://trac.webkit.org/wiki/LayoutUnit). 1/60 was tried originally, but it was switched to 1/64 for performance and to avoid precision loss. The reason it's faster is interesting: floating point values are also stored as number with a base-2 exponent, so to convert to/from floats, you can use shifts instead of needing division. The differences between 1/60 and 1/64 were important 10 years ago but are pretty minor now.
Blink and WebKit are less sexy and use tetrasexagesimal a.k.a. 1/64 (https://trac.webkit.org/wiki/LayoutUnit). 1/60 was tried originally, but it was switched to 1/64 for performance and to avoid precision loss. The reason it's faster is interesting: floating point values are also stored as number with a base-2 exponent, so to convert to/from floats, you can use shifts instead of needing division. The differences between 1/60 and 1/64 were important 10 years ago but are pretty minor now.
If you're interested, the code is at https://github.com/mozilla/gecko-dev/blob/d36cf98aa85f24ceef... and https://source.chromium.org/chromium/chromium/src/+/main:thi...