1.10.0

https://www.w3.org/TR/2021/WD-css-align-3-20211224/

after/syntax/css/conditional-5.vim

@@ -0,0 +1 @@
+syn match cssFontDescriptor "@\(when\|else\)\>" nextgroup=cssFontDescriptorBlock skipwhite skipnl

after/syntax/css/overflow-3.vim

@@ -1,5 +1,6 @@
 syn keyword cssFontProp contained continue
 syn match cssFontProp contained "\<overflow-\(clip-margin\|block\|inline\)\>"
+syn match cssFontProp contained "\<scrollbar-gutter\>"
 syn match cssFontProp contained "\<block-ellipsis\>"
 syn match cssFontProp contained "\<line-clamp\>"
 syn match cssFontProp contained "\<max-lines\>"

after/syntax/css/overflow-4.vim

@@ -1,3 +1,2 @@
-syn match cssFontProp contained "\<scrollbar-gutter\>"
 syn keyword cssFontAttr contained stable force overflow paginate fragments
 syn region cssPseudoClassLang matchgroup=cssPseudoClassId start=":\(nth-fragment\)(" end=")" oneline

after/syntax/css/ruby-1.vim

@@ -1,3 +1,4 @@
 syn match cssFontProp contained "\<ruby-\(position\|merge\|align\|overhang\)"
+syn keyword cssFontAttr contained merge
 syn match cssFontAttr contained "\<ruby-\(base\|text\)-container\>"
 syn match cssFontAttr contained "\<inter-character\>"

after/syntax/css/values-4.vim

@@ -1,3 +1,3 @@
 syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(rex\|cap\|rcap\|rch\|ic\|ric\|lh\|rlh\)"
 syn match cssValueLength contained "[-+]\=\d\+\(\.\d*\)\=\(s\|l\|d\)\=v\(h\|w\|i\|b\|min\|max\)"
-syn region cssFunction contained matchgroup=cssFunctionName start="\<\(mix\|min\|max\|clamp\|toggle\|round\|mod\|rem\|a\=\(sin\|cos\|tan\)\|atan2\|pow\|sqrt\|hypot\|log\|exp\|abs\|sign\)\s*(" end=")" oneline keepend
+syn region cssFunction contained matchgroup=cssFunctionName start="\<\(mix\|min\|max\|clamp\|round\|mod\|rem\|a\=\(sin\|cos\|tan\)\|atan2\|pow\|sqrt\|hypot\|log\|exp\|abs\|sign\)\s*(" end=")" oneline keepend

test/test.css

@@ -141,8 +141,20 @@
 }
 
 @supports (selector(.conditional-4)) {
+	.conditional-4 {
 		display: auto;
 	}
+}
+
+@when media(screen) {
+	.conditional-5 {
+		display: auto;
+	}
+} @else {
+	.conditional-5 {
+		display: auto;
+	}
+}
 
 .contain-1 {
 	contain: auto;
@@ -155,6 +167,10 @@
 	content-visibility: auto;
 }
 
+.contain-3 {
+	display: auto;
+}
+
 .content-3 {
 	string-set: auto;
 	bookmark-level: auto;
@@ -629,6 +645,7 @@ mask {
 	overflow-clip-margin: auto;
 	overflow-block: auto;
 	overflow-inline: auto;
+	scrollbar-gutter: auto;
 	block-ellipsis: auto;
 	line-clamp: auto;
 	max-lines: auto;
@@ -636,7 +653,6 @@ mask {
 }
 
 .overflow-4::nth-fragment(1) {
-	scrollbar-gutter: auto;
 	display: stable;
 	display: force;
 	display: overflow;
@@ -752,6 +768,7 @@ mask {
 	ruby-overhang: auto;
 	display: ruby-base-container;
 	display: ruby-text-container;
+	display: merge;
 	display: inter-character;
 }