diff --git a/after/syntax/css/color-4.vim b/after/syntax/css/color-4.vim
index 6a7fbb6..44d27c9 100644
--- a/after/syntax/css/color-4.vim
+++ b/after/syntax/css/color-4.vim
@@ -1,2 +1,4 @@
+syn keyword cssFontAttr contained perceptual
+syn match cssFontAttr contained "\<\(relative\|absolute\)-colorimetric\>"
 syn region cssFunction contained matchgroup=cssFunctionName start="\<\(hwb\|lab\|lch\|gray\|color\|device-cmyk\=\)\s*(" end=")" oneline keepend
 syn match cssFontDescriptor "@color-profile\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl
diff --git a/test/test.css b/test/test.css
index 73ac646..e38792d 100644
--- a/test/test.css
+++ b/test/test.css
@@ -94,6 +94,9 @@
   display: gray(50%);
   display: color(swopc, 0 206 190 77);
   display: device-cmyk(0, 81%, 81%, 30%);
+  display: relative-colorimetric;
+  display: absolute-colorimetric;
+  display: perceptual;
 }
 
 @color-profile swopc {