📅 September 2026 release notes
Newly available
The following features are newly available:
-
progress():
The
progress()CSS function returns a ratio for the relative position of one value between two other values, clamped between 0 and 1. You can use it to interpolate a value for other calculations.
New in Firefox
The following features are now available in Firefox:
-
alpha():
The
alpha()CSS function computes a relative color value by adjusting the opacity of an origin color.
New in Firefox for Android
The following features are now available in Firefox for Android:
-
alpha():
The
alpha()CSS function computes a relative color value by adjusting the opacity of an origin color.