custom properties without values are valid

Author: rbri

src/main/javacc/CSS3Parser.jj

@@ -777,11 +777,14 @@ Property mediaExpression() :
   String p;
   LexicalUnit e = null;
   Property prop;
+  Token t;
 }
 {
     <LROUND>
     ( <S> )*
-    p = property()
+    (        t = <IDENT> ( <S> )*                    { p = unescape(t.image, false); }
+        | t = <CUSTOM_PROPERTY_NAME> ( <S> )*   { p = unescape(t.image, false); }
+    )
     (
       <COLON> ( <S> )*
       e = expr()
@@ -1007,19 +1010,6 @@ char unaryOperator() :
   ( <MINUS> { return '-'; } | <PLUS> { return '+'; } )
 }
 
-//
-// property
-//   : IDENT S*
-//   ;
-//
-String property() :
-{
-    Token t;
-}
-{
-    t = <IDENT> ( <S> )*                    { return unescape(t.image, false); }
-    | t = <CUSTOM_PROPERTY_NAME> ( <S> )*   { return unescape(t.image, false); }
-}
 
 //
 // ruleset
@@ -1476,7 +1466,7 @@ void styleDeclaration()  :
 void declaration() :
 {
   String p;
-  LexicalUnit e;
+  LexicalUnit e = null;
   Token t;
   boolean priority = false;
   Locator starHack = null;
@@ -1489,12 +1479,18 @@ void declaration() :
         // infamous css-star-hack (http://en.wikipedia.org/wiki/CSS_filter#Star_hack)
         // smart (means: ignoring only one decl)
         ( <ASTERISK> { starHack = createLocator(token); } )?
-        p = property()
-        {
-            locator = createLocator(token);
-        }
-        <COLON> ( <S> )*
-        e = expr()
+        (            (
+                t = <IDENT> ( <S> )*                    { p = unescape(t.image, false); locator = createLocator(t); }
+                <COLON> ( <S> )*
+                e = expr()
+            )
+            |
+            (                t = <CUSTOM_PROPERTY_NAME> ( <S> )*   { p = unescape(t.image, false); locator = createLocator(t); }
+                <COLON> ( <S> )*
+                ( e = expr() )?
+            )
+        )
+        
         ( priority = prio() )?
 
         // maybe there are strange characters at the end - create error and skip

src/test/java/org/htmlunit/cssparser/parser/CSS3ParserTest.java

@@ -1575,6 +1575,7 @@ public void varExpressions() throws Exception {
         expression("h1 { --my-var: 2px; }");
         expression("h1 { --my-var: 10pt; }");
         expression("h1 { --my-var: 11%; }");
+        expression("h1 { --my-var: ; }");
         expression("h1 { --my-var: rgb(255, 255, 255); }");
         expression("h1 { --my-var: rgba(255, 255, 255, 0); }");
         expression("h1 { --my-var: var(--test); }");
@@ -4193,8 +4194,8 @@ public void realWorldBootstrap520() throws Exception {
                 + "(prefers-reduced-motion: no-preference);"
                 + "(prefers-reduced-motion: reduce);"
                 + "print;";
-        realWorld("realworld/bootstrap_5_2_0.css", 1198, 3018, media, 55, 0);
-        realWorld("realworld/bootstrap_5_2_0.min.css", 1198, 3018, media, 55, 0);
+        realWorld("realworld/bootstrap_5_2_0.css", 1198, 3033, media, 40, 0);
+        realWorld("realworld/bootstrap_5_2_0.min.css", 1198, 3033, media, 40, 0);
     }
 
     /**