Add css-color-4.vim

See also: https://www.w3.org/TR/2016/WD-css-color-4-20160705/

Author: hail2u

after/syntax/css/css-color-4.vim

@@ -0,0 +1,4 @@
+syn match cssColorProp contained "\<color-adjust\>"
+syn keyword cssColor contained rebeccapurple
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(hwb\|lab\|lch\|gray\|color\|device-cmyk\|color-mod\=\)\s*(" end=")" oneline keepend
+syn match cssFontDescriptor "@color-profile\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl

after/syntax/css/css3-color.vim

@@ -1,3 +1,3 @@
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(rgba\|hsla\=\)\s*(" end=")" oneline keepend
 syn keyword cssColorProp contained opacity
-syn match cssColor contained "\<currentColor\>"
+syn match cssColor contained "\<currentcolor\>"

after/syntax/html.vim

@@ -5,6 +5,7 @@ syn include @htmlCss syntax/css/css-break-3.vim
 syn include @htmlCss syntax/css/css-cascade-3.vim
 syn include @htmlCss syntax/css/css-cascade-4.vim
 syn include @htmlCss syntax/css/css-content-3.vim
+syn include @htmlCss syntax/css/css-color-4.vim
 syn include @htmlCss syntax/css/css-counter-styles-3.vim
 syn include @htmlCss syntax/css/css-device-adapt-1.vim
 syn include @htmlCss syntax/css/css-display-3.vim

test/test.css

@@ -90,7 +90,22 @@
 .color {
   opacity: rgba(0, 0, 0, 1);
   display: hsla(0, 0, 0, 1);
-  display: currentColor;
+  display: currentcolor;
+}
+
+@color-profile swopc {
+  src: url('http://example.org/swop-coated.icc');
+}
+
+.color-4 {
+  color-adjust: rebeccapurple;
+  display: hwb(120deg, 44%, 50%);
+  display: lab(1 2 3);
+  display: lch(4 5 6);
+  display: gray(50%);
+  display: color(swopc, 0 206 190 77);
+  display: device-cmyk(0, 81%, 81%, 30%);
+  display: color-mod(#112233 tint(50%));
 }
 
 @supports (display: auto) or

test/test.html

@@ -108,7 +108,23 @@
 .color {
   opacity: rgba(0, 0, 0, 1);
   display: hsla(0, 0, 0, 1);
-  display: currentColor;
+  display: currentcolor;
+}
+</style>
+<style>
+@color-profile swopc {
+  src: url('http://example.org/swop-coated.icc');
+}
+
+.color-4 {
+  color-adjust: rebeccapurple;
+  display: hwb(120deg, 44%, 50%);
+  display: lab(1 2 3);
+  display: lch(4 5 6);
+  display: gray(50%);
+  display: color(swopc, 0 206 190 77);
+  display: device-cmyk(0, 81%, 81%, 30%);
+  display: color-mod(#112233 tint(50%));
 }
 </style>
 <style>