diff --git a/Userland/Libraries/LibWeb/CSS/Selector.cpp b/Userland/Libraries/LibWeb/CSS/Selector.cpp
index a532df7dd9c..e20647dd4a8 100644
--- a/Userland/Libraries/LibWeb/CSS/Selector.cpp
+++ b/Userland/Libraries/LibWeb/CSS/Selector.cpp
@@ -5,9 +5,6 @@
  */
 
 #include "Selector.h"
-#include <AK/GenericLexer.h>
-#include <AK/StringUtils.h>
-#include <ctype.h>
 
 namespace Web::CSS {
 
@@ -47,75 +44,4 @@ u32 Selector::specificity() const
     return ids * 0x10000 + classes * 0x100 + tag_names;
 }
 
-Selector::SimpleSelector::ANPlusBPattern Selector::SimpleSelector::ANPlusBPattern::parse(StringView const& args)
-{
-    // FIXME: Remove this when the DeprecatedCSSParser is gone.
-    // The new Parser::parse_nth_child_pattern() does the same as this, using Tokens.
-    CSS::Selector::SimpleSelector::ANPlusBPattern pattern;
-    if (args.equals_ignoring_case("odd")) {
-        pattern.step_size = 2;
-        pattern.offset = 1;
-    } else if (args.equals_ignoring_case("even")) {
-        pattern.step_size = 2;
-    } else {
-        auto const consume_int = [](GenericLexer& lexer) -> Optional<int> {
-            return AK::StringUtils::convert_to_int(lexer.consume_while([](char c) -> bool {
-                return isdigit(c) || c == '+' || c == '-';
-            }));
-        };
-
-        // Try to match any of following patterns:
-        // 1. An+B
-        // 2. An
-        // 3. B
-        // ...where "A" is "step_size", "B" is "offset" and rest are literals.
-        // "A" can be omitted, in that case "A" = 1.
-        // "A" may have "+" or "-" sign, "B" always must be predated by sign for pattern (1).
-
-        int step_size_or_offset = 0;
-        GenericLexer lexer { args };
-
-        // "When a=1, or a=-1, the 1 may be omitted from the rule."
-        if (lexer.consume_specific("n") || lexer.consume_specific("+n")) {
-            step_size_or_offset = +1;
-            lexer.retreat();
-        } else if (lexer.consume_specific("-n")) {
-            step_size_or_offset = -1;
-            lexer.retreat();
-        } else {
-            auto const value = consume_int(lexer);
-            if (!value.has_value())
-                return {};
-            step_size_or_offset = value.value();
-        }
-
-        if (lexer.consume_specific("n")) {
-            lexer.ignore_while(isspace);
-            if (lexer.next_is('+') || lexer.next_is('-')) {
-                auto const sign = lexer.next_is('+') ? 1 : -1;
-                lexer.ignore();
-                lexer.ignore_while(isspace);
-
-                // "An+B" pattern
-                auto const offset = consume_int(lexer);
-                if (!offset.has_value())
-                    return {};
-                pattern.step_size = step_size_or_offset;
-                pattern.offset = sign * offset.value();
-            } else {
-                // "An" pattern
-                pattern.step_size = step_size_or_offset;
-            }
-        } else {
-            // "B" pattern
-            pattern.offset = step_size_or_offset;
-        }
-
-        if (lexer.remaining().length() > 0)
-            return {};
-    }
-
-    return pattern;
-}
-
 }
diff --git a/Userland/Libraries/LibWeb/CSS/Selector.h b/Userland/Libraries/LibWeb/CSS/Selector.h
index e9a8ea6a19d..d5941bd125e 100644
--- a/Userland/Libraries/LibWeb/CSS/Selector.h
+++ b/Userland/Libraries/LibWeb/CSS/Selector.h
@@ -37,7 +37,6 @@ public:
             int step_size { 0 }; // "A"
             int offset = { 0 };  // "B"
 
-            static ANPlusBPattern parse(StringView const& args);
             String to_string() const
             {
                 return String::formatted("{}n{:+}", step_size, offset);