diff --git a/Libraries/LibWeb/CSS/CSSStyleSheet.cpp b/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
index f929a1e7131..f79ab359ae0 100644
--- a/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
+++ b/Libraries/LibWeb/CSS/CSSStyleSheet.cpp
@@ -140,8 +140,7 @@ WebIDL::ExceptionOr<unsigned> CSSStyleSheet::insert_rule(StringView rule, unsign
         return WebIDL::NotAllowedError::create(realm(), "Can't call insert_rule() on non-modifiable stylesheets."_string);
 
     // 3. Let parsed rule be the return value of invoking parse a rule with rule.
-    auto context = !m_owning_documents_or_shadow_roots.is_empty() ? Parser::ParsingParams { (*m_owning_documents_or_shadow_roots.begin())->document() } : Parser::ParsingParams { realm() };
-    auto parsed_rule = parse_css_rule(context, rule);
+    auto parsed_rule = parse_css_rule(make_parsing_params(), rule);
 
     // 4. If parsed rule is a syntax error, return parsed rule.
     if (!parsed_rule)
@@ -208,8 +207,7 @@ GC::Ref<WebIDL::Promise> CSSStyleSheet::replace(String text)
         HTML::TemporaryExecutionContext execution_context { realm, HTML::TemporaryExecutionContext::CallbacksEnabled::Yes };
 
         // 1. Let rules be the result of running parse a stylesheet’s contents from text.
-        auto context = !m_owning_documents_or_shadow_roots.is_empty() ? Parser::ParsingParams { (*m_owning_documents_or_shadow_roots.begin())->document() } : CSS::Parser::ParsingParams { realm };
-        auto* parsed_stylesheet = parse_css_stylesheet(context, text);
+        auto* parsed_stylesheet = parse_css_stylesheet(make_parsing_params(), text);
         auto& rules = parsed_stylesheet->rules();
 
         // 2. If rules contains one or more @import rules, remove those rules from rules.
@@ -242,8 +240,7 @@ WebIDL::ExceptionOr<void> CSSStyleSheet::replace_sync(StringView text)
         return WebIDL::NotAllowedError::create(realm(), "Can't call replaceSync() on non-modifiable stylesheets"_string);
 
     // 2. Let rules be the result of running parse a stylesheet’s contents from text.
-    auto context = !m_owning_documents_or_shadow_roots.is_empty() ? Parser::ParsingParams { (*m_owning_documents_or_shadow_roots.begin())->document() } : CSS::Parser::ParsingParams { realm() };
-    auto* parsed_stylesheet = parse_css_stylesheet(context, text);
+    auto* parsed_stylesheet = parse_css_stylesheet(make_parsing_params(), text);
     auto& rules = parsed_stylesheet->rules();
 
     // 3. If rules contains one or more @import rules, remove those rules from rules.
@@ -426,4 +423,11 @@ bool CSSStyleSheet::has_associated_font_loader(FontLoader& font_loader) const
     return false;
 }
 
+Parser::ParsingParams CSSStyleSheet::make_parsing_params() const
+{
+    if (!m_owning_documents_or_shadow_roots.is_empty())
+        return Parser::ParsingParams { (*m_owning_documents_or_shadow_roots.begin())->document() };
+    return Parser::ParsingParams { realm() };
+}
+
 }
diff --git a/Libraries/LibWeb/CSS/CSSStyleSheet.h b/Libraries/LibWeb/CSS/CSSStyleSheet.h
index aba78f28c1c..ecb4ece8e77 100644
--- a/Libraries/LibWeb/CSS/CSSStyleSheet.h
+++ b/Libraries/LibWeb/CSS/CSSStyleSheet.h
@@ -12,6 +12,7 @@
 #include <LibWeb/CSS/CSSRule.h>
 #include <LibWeb/CSS/CSSRuleList.h>
 #include <LibWeb/CSS/CSSStyleRule.h>
+#include <LibWeb/CSS/Parser/Parser.h>
 #include <LibWeb/CSS/StyleSheet.h>
 #include <LibWeb/DOM/Node.h>
 #include <LibWeb/WebIDL/Types.h>
@@ -105,6 +106,8 @@ private:
     void set_constructed(bool constructed) { m_constructed = constructed; }
     void set_disallow_modification(bool disallow_modification) { m_disallow_modification = disallow_modification; }
 
+    Parser::ParsingParams make_parsing_params() const;
+
     Optional<String> m_source_text;
 
     GC::Ptr<CSSRuleList> m_rules;