update linear-gradient syntax to use optional color-interpolation-method

css/syntaxes.json

@@ -137,6 +137,9 @@
  "color-stop-list": {
  "syntax": "[ <linear-color-stop> [, <linear-color-hint>]? ]# , <linear-color-stop>"
  },
+ "color-interpolation-method": {
+ "syntax": "in [ <rectangular-color-space> | <polar-color-space> <hue-interpolation-method>? ]"
+ },
  "combinator": {
  "syntax": "'>' | '+' | '~' | [ '||' ]"
  },
@@ -356,6 +359,9 @@
  "hue-rotate()": {
  "syntax": "hue-rotate( <angle> )"
  },
+ "hue-interpolation-method": {
+ "syntax": "[ shorter | longer | increasing | decreasing ] hue"
+ },
  "hwb()": {
  "syntax": "hwb( [<hue> | none] [<percentage> | none] [<percentage> | none] [ / [<alpha-value> | none] ]? )"
  },
@@ -447,7 +453,7 @@
  "syntax": "<color> <color-stop-length>?"
  },
  "linear-gradient()": {
- "syntax": "linear-gradient( [ <angle> | to <side-or-corner> ]? , <color-stop-list> )"
+ "syntax": "linear-gradient( [ [ <angle> | to <side-or-corner> ] || <color-interpolation-method> ]? , <color-stop-list> )"
  },
  "log()": {
  "syntax": "log( <calc-sum>, <calc-sum>? )"
@@ -596,6 +602,9 @@
  "polygon()": {
  "syntax": "polygon( <fill-rule>? , [ <length-percentage> <length-percentage> ]# )"
  },
+ "polar-color-space": {
+ "syntax": "hsl | hwb | lch | oklch"
+ },
  "position": {
  "syntax": "[ [ left | center | right ] || [ top | center | bottom ] | [ left | center | right | <length-percentage> ] [ top | center | bottom | <length-percentage> ]? | [ [ left | right ] <length-percentage> ] && [ [ top | bottom ] <length-percentage> ] ]"
  },
@@ -626,6 +635,9 @@
  "ray-size": {
  "syntax": "closest-side | closest-corner | farthest-side | farthest-corner | sides"
  },
+ "rectangular-color-space": {
+ "syntax": "srgb | srgb-linear | display-p3 | a98-rgb | prophoto-rgb | rec2020 | lab | oklab | xyz | xyz-d50 | xyz-d65"
+ },
  "relative-selector": {
  "syntax": "<combinator>? <complex-selector>"
  },