diff --git a/Libraries/LibWeb/CSS/Parser/Parser.h b/Libraries/LibWeb/CSS/Parser/Parser.h
index 9d62892bbcd..3575992fc33 100644
--- a/Libraries/LibWeb/CSS/Parser/Parser.h
+++ b/Libraries/LibWeb/CSS/Parser/Parser.h
@@ -293,7 +293,7 @@ private:
     Optional<PropertyAndValue> parse_css_value_for_properties(ReadonlySpan<PropertyID>, TokenStream<ComponentValue>&);
     RefPtr<CSSStyleValue> parse_builtin_value(TokenStream<ComponentValue>&);
     RefPtr<CSSStyleValue> parse_calculated_value(ComponentValue const&);
-    RefPtr<CustomIdentStyleValue> parse_custom_ident_value(TokenStream<ComponentValue>&, std::initializer_list<StringView> blacklist);
+    RefPtr<CustomIdentStyleValue> parse_custom_ident_value(TokenStream<ComponentValue>&, ReadonlySpan<StringView> blacklist);
     // NOTE: Implemented in generated code. (GenerateCSSMathFunctions.cpp)
     RefPtr<CalculationNode> parse_math_function(Function const&, CalculationContext const&);
     RefPtr<CalculationNode> parse_a_calc_function_node(Function const&, CalculationContext const&);
diff --git a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
index 529cb453cb3..c52072482e1 100644
--- a/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/PropertyParsing.cpp
@@ -839,7 +839,7 @@ RefPtr<CSSStyleValue> Parser::parse_color_scheme_value(TokenStream<ComponentValu
 
         // The 'normal', 'light', 'dark', and 'only' keywords are not valid <custom-ident>s in this property.
         // Note: only 'normal' is blacklisted here because 'light' and 'dark' aren't parsed differently and 'only' is checked for afterwards
-        auto ident = parse_custom_ident_value(tokens, { "normal"sv });
+        auto ident = parse_custom_ident_value(tokens, { { "normal"sv } });
         if (!ident)
             return {};
 
@@ -4452,7 +4452,7 @@ RefPtr<CSSStyleValue> Parser::parse_view_transition_name_value(TokenStream<Compo
 
         // The values 'none' and 'auto' are excluded from <custom-ident> here.
         // Note: Only auto is excluded here since none isn't parsed differently.
-        auto ident = parse_custom_ident_value(tokens, { "auto"sv });
+        auto ident = parse_custom_ident_value(tokens, { { "auto"sv } });
         if (!ident)
             return {};
 
diff --git a/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp b/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
index 2f92767f761..faedd4a824b 100644
--- a/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
+++ b/Libraries/LibWeb/CSS/Parser/ValueParsing.cpp
@@ -1796,7 +1796,7 @@ RefPtr<CSSStyleValue> Parser::parse_counter_value(TokenStream<ComponentValue>& t
         auto transaction = tokens.begin_transaction();
         tokens.discard_whitespace();
 
-        auto counter_name = parse_custom_ident_value(tokens, { "none"sv });
+        auto counter_name = parse_custom_ident_value(tokens, { { "none"sv } });
         if (!counter_name)
             return {};
 
@@ -1817,7 +1817,7 @@ RefPtr<CSSStyleValue> Parser::parse_counter_value(TokenStream<ComponentValue>& t
         auto transaction = tokens.begin_transaction();
         tokens.discard_whitespace();
 
-        auto counter_style_name = parse_custom_ident_value(tokens, { "none"sv });
+        auto counter_style_name = parse_custom_ident_value(tokens, { { "none"sv } });
         if (!counter_style_name)
             return {};
 
@@ -2812,7 +2812,7 @@ RefPtr<CSSStyleValue> Parser::parse_builtin_value(TokenStream<ComponentValue>& t
 }
 
 // https://www.w3.org/TR/css-values-4/#custom-idents
-RefPtr<CustomIdentStyleValue> Parser::parse_custom_ident_value(TokenStream<ComponentValue>& tokens, std::initializer_list<StringView> blacklist)
+RefPtr<CustomIdentStyleValue> Parser::parse_custom_ident_value(TokenStream<ComponentValue>& tokens, ReadonlySpan<StringView> blacklist)
 {
     auto transaction = tokens.begin_transaction();
     tokens.discard_whitespace();
@@ -3096,7 +3096,7 @@ RefPtr<GridTrackPlacementStyleValue> Parser::parse_grid_track_placement(TokenStr
     };
     auto parse_custom_ident = [this](auto& tokens) {
         // The <custom-ident> additionally excludes the keywords span and auto.
-        return parse_custom_ident_value(tokens, { "span"sv, "auto"sv });
+        return parse_custom_ident_value(tokens, { { "span"sv, "auto"sv } });
     };
 
     auto transaction = tokens.begin_transaction();