diff --git a/Userland/Libraries/LibWeb/DOM/Element.h b/Userland/Libraries/LibWeb/DOM/Element.h
index 9a3e7cfed4..b5e1a4aee8 100644
--- a/Userland/Libraries/LibWeb/DOM/Element.h
+++ b/Userland/Libraries/LibWeb/DOM/Element.h
@@ -78,7 +78,6 @@ public:
     FlyString const& html_uppercased_qualified_name() const { return m_html_uppercased_qualified_name; }
 
     virtual FlyString node_name() const final { return html_uppercased_qualified_name(); }
-    DeprecatedFlyString deprecated_local_name() const { return m_qualified_name.local_name().to_deprecated_fly_string(); }
     FlyString const& local_name() const { return m_qualified_name.local_name(); }
 
     // NOTE: This is for the JS bindings
@@ -86,7 +85,6 @@ public:
     DeprecatedString deprecated_tag_name() const { return html_uppercased_qualified_name().to_deprecated_fly_string(); }
 
     Optional<FlyString> const& prefix() const { return m_qualified_name.prefix(); }
-    DeprecatedFlyString deprecated_prefix() const { return m_qualified_name.deprecated_prefix(); }
 
     void set_prefix(Optional<FlyString> value);
 
diff --git a/Userland/Libraries/LibWeb/DOM/QualifiedName.cpp b/Userland/Libraries/LibWeb/DOM/QualifiedName.cpp
index 564c0ecbe0..72f5a79d85 100644
--- a/Userland/Libraries/LibWeb/DOM/QualifiedName.cpp
+++ b/Userland/Libraries/LibWeb/DOM/QualifiedName.cpp
@@ -54,11 +54,6 @@ QualifiedName::QualifiedName(FlyString const& local_name, Optional<FlyString> co
 {
 }
 
-QualifiedName::QualifiedName(FlyString const& local_name, Optional<FlyString> const& prefix, DeprecatedFlyString const& namespace_)
-    : QualifiedName(local_name, prefix, namespace_.is_null() ? Optional<FlyString> {} : MUST(FlyString::from_deprecated_fly_string(namespace_)))
-{
-}
-
 QualifiedName::Impl::Impl(FlyString const& a_local_name, Optional<FlyString> const& a_prefix, Optional<FlyString> const& a_namespace)
     : local_name(a_local_name)
     , prefix(a_prefix)
diff --git a/Userland/Libraries/LibWeb/DOM/QualifiedName.h b/Userland/Libraries/LibWeb/DOM/QualifiedName.h
index ea00c4477c..3dc557c0f7 100644
--- a/Userland/Libraries/LibWeb/DOM/QualifiedName.h
+++ b/Userland/Libraries/LibWeb/DOM/QualifiedName.h
@@ -1,13 +1,13 @@
 /*
  * Copyright (c) 2020, the SerenityOS developers.
  * Copyright (c) 2022, Andreas Kling <kling@serenityos.org>
+ * Copyright (c) 2023, Shannon Booth <shannon@serenityos.org>
  *
  * SPDX-License-Identifier: BSD-2-Clause
  */
 
 #pragma once
 
-#include <AK/DeprecatedFlyString.h>
 #include <AK/FlyString.h>
 #include <AK/Optional.h>
 
@@ -16,26 +16,11 @@ namespace Web::DOM {
 class QualifiedName {
 public:
     QualifiedName(FlyString const& local_name, Optional<FlyString> const& prefix, Optional<FlyString> const& namespace_);
-    QualifiedName(FlyString const& local_name, Optional<FlyString> const& prefix, DeprecatedFlyString const& namespace_);
 
     FlyString const& local_name() const { return m_impl->local_name; }
     Optional<FlyString> const& prefix() const { return m_impl->prefix; }
     Optional<FlyString> const& namespace_() const { return m_impl->namespace_; }
 
-    DeprecatedFlyString deprecated_prefix() const
-    {
-        if (!m_impl->prefix.has_value())
-            return {};
-        return m_impl->prefix->to_deprecated_fly_string();
-    }
-
-    DeprecatedFlyString deprecated_namespace_() const
-    {
-        if (!m_impl->namespace_.has_value())
-            return {};
-        return m_impl->namespace_->to_deprecated_fly_string();
-    }
-
     FlyString const& as_string() const { return m_impl->as_string; }
 
     struct Impl : public RefCounted<Impl> {