Add CSS math functions (#608)

* Add CSS math functions

* Update calc-constants.yml

* Update calc-constants.yml

* Update calc.yml

* Update and rename css-comparison.yml to min-max-clamp.yml

* Update and rename css-exponential.yml to exponential-functions.yml

* Update calc.yml

* Update and rename css-round.yml to round-mod-rem.yml

* Update and rename css-trig.yml to trig-functions.yml

* Update and rename css-sign.yml to abs-sign.yml

* Rename exponential-functions.yml to exp-functions.yml

Author: foolip

feature-group-definitions/abs-sign.yml

@@ -0,0 +1,6 @@
+name: abs() and sign()
+description: The `abs()` and `sign()` CSS functions compute the absolute value or the sign of the input.
+spec: https://drafts.csswg.org/css-values-4/#sign-funcs
+compat_features:
+  - css.types.abs
+  - css.types.sign

feature-group-definitions/calc-constants.yml

@@ -0,0 +1,9 @@
+name: calc() constants
+description: The `e`, `pi`, `infinity`, and `NaN` constants are accepted in CSS math functions such as `calc()`.
+spec: https://drafts.csswg.org/css-values-4/#calc-keywords
+compat_features:
+  - css.types.calc-constant
+  - css.types.calc-constant.NaN
+  - css.types.calc-constant.e
+  - css.types.calc-constant.infinity
+  - css.types.calc-constant.pi

feature-group-definitions/calc.yml

@@ -0,0 +1,9 @@
+name: calc()
+description: The `calc()` CSS function computes mathematical expressions such a `calc(100%/3 - 1em)`.
+spec: https://drafts.csswg.org/css-values-3/#calc-notation
+caniuse: calc
+compat_features:
+  - css.types.calc
+  - css.types.calc.gradient_color_stops
+  - css.types.calc.nested
+  - css.types.calc.number_values

feature-group-definitions/exp-functions.yml

@@ -0,0 +1,9 @@
+name: pow(), sqrt(), hypot(), log(), and exp()
+description: The `pow()`, `sqrt()`, `hypot()`, `log()`, and `exp()` CSS functions compute various exponential functions.
+spec: https://drafts.csswg.org/css-values-4/#exponent-funcs
+compat_features:
+  - css.types.pow
+  - css.types.sqrt
+  - css.types.hypot
+  - css.types.log
+  - css.types.exp

feature-group-definitions/min-max-clamp.yml

@@ -0,0 +1,7 @@
+name: min(), max(), and clamp()
+description: The `min()` and `max()` CSS functions return the minimum or maximum of the arguments, while `clamp()` clamps a value to a given range.
+spec: https://drafts.csswg.org/css-values-4/#comp-func
+compat_features:
+  - css.types.min
+  - css.types.max
+  - css.types.clamp

feature-group-definitions/round-mod-rem.yml

@@ -0,0 +1,7 @@
+name: round(), mod(), and rem()
+description: The `round()`, `mod()`, and `rem()` CSS functions compute rounded values and the remainder after division.
+spec: https://drafts.csswg.org/css-values-4/#round-func
+compat_features:
+  - css.types.round
+  - css.types.mod
+  - css.types.rem

feature-group-definitions/trig-functions.yml

@@ -0,0 +1,11 @@
+name: sin(), cos(), tan(), asin(), acos(), atan(), and atan2()
+description: The `sin()`, `cos()`, `tan()`, `asin()`, `acos()`, `atan()`, and `atan2()` CSS functions compute various trigonometric functions.
+spec: https://drafts.csswg.org/css-values-4/#trig-funcs
+compat_features:
+  - css.types.sin
+  - css.types.cos
+  - css.types.tan
+  - css.types.asin
+  - css.types.acos
+  - css.types.atan
+  - css.types.atan2