diff --git a/Userland/Applications/Browser/InspectorWidget.cpp b/Userland/Applications/Browser/InspectorWidget.cpp
index d18d42a58d..773eec9b06 100644
--- a/Userland/Applications/Browser/InspectorWidget.cpp
+++ b/Userland/Applications/Browser/InspectorWidget.cpp
@@ -23,7 +23,7 @@ namespace Browser {
 
 void InspectorWidget::set_selection(Selection selection)
 {
-    if (!m_dom_json.has_value()) {
+    if (!m_dom_loaded) {
         // DOM Tree hasn't been loaded yet, so make a note to inspect it later.
         m_pending_selection = move(selection);
         return;
@@ -32,7 +32,7 @@ void InspectorWidget::set_selection(Selection selection)
     auto* model = verify_cast<WebView::DOMTreeModel>(m_dom_tree_view->model());
     auto index = model->index_for_node(selection.dom_node_id, selection.pseudo_element);
     if (!index.is_valid()) {
-        dbgln("InspectorWidget told to inspect non-existent node: {}", selection.to_deprecated_string());
+        dbgln("InspectorWidget told to inspect non-existent node: {}", selection.to_string());
         return;
     }
 
@@ -64,7 +64,7 @@ void InspectorWidget::set_selection(GUI::ModelIndex const index)
     auto maybe_inspected_node_properties = m_web_view->inspect_dom_node(m_selection.dom_node_id, m_selection.pseudo_element);
     if (maybe_inspected_node_properties.has_value()) {
         auto inspected_node_properties = maybe_inspected_node_properties.value();
-        load_style_json(inspected_node_properties.specified_values_json, inspected_node_properties.computed_values_json, inspected_node_properties.custom_properties_json);
+        load_style_json(inspected_node_properties.computed_values_json, inspected_node_properties.resolved_values_json, inspected_node_properties.custom_properties_json);
         update_node_box_model(inspected_node_properties.node_box_sizing_json);
     } else {
         clear_style_json();
@@ -126,60 +126,49 @@ void InspectorWidget::select_default_node()
     m_dom_tree_view->set_cursor({}, GUI::AbstractView::SelectionUpdate::ClearIfNotSelected);
 }
 
-void InspectorWidget::set_dom_json(DeprecatedString json)
+void InspectorWidget::set_dom_json(StringView json)
 {
-    if (m_dom_json.has_value() && m_dom_json.value() == json)
-        return;
-
-    m_dom_json = json;
-    m_dom_tree_view->set_model(WebView::DOMTreeModel::create(m_dom_json->view(), *m_dom_tree_view));
-
-    if (m_pending_selection.has_value()) {
+    m_dom_tree_view->set_model(WebView::DOMTreeModel::create(json, *m_dom_tree_view));
+    if (m_pending_selection.has_value())
         set_selection(m_pending_selection.release_value());
-    } else {
+    else
         select_default_node();
-    }
+    m_dom_loaded = true;
 }
 
 void InspectorWidget::clear_dom_json()
 {
-    m_dom_json.clear();
     m_dom_tree_view->set_model(nullptr);
     clear_style_json();
+    m_dom_loaded = false;
 }
 
-void InspectorWidget::set_dom_node_properties_json(Selection selection, DeprecatedString specified_values_json, DeprecatedString computed_values_json, DeprecatedString custom_properties_json, DeprecatedString node_box_sizing_json)
+void InspectorWidget::set_dom_node_properties_json(Selection selection, StringView computed_values_json, StringView resolved_values_json, StringView custom_properties_json, StringView node_box_sizing_json)
 {
     if (selection != m_selection) {
-        dbgln("Got data for the wrong node id! Wanted ({}), got ({})", m_selection.to_deprecated_string(), selection.to_deprecated_string());
+        dbgln("Got data for the wrong node id! Wanted ({}), got ({})", m_selection.to_string(), selection.to_string());
         return;
     }
 
-    load_style_json(specified_values_json, computed_values_json, custom_properties_json);
+    load_style_json(computed_values_json, resolved_values_json, custom_properties_json);
     update_node_box_model(node_box_sizing_json);
 }
 
-void InspectorWidget::load_style_json(DeprecatedString specified_values_json, DeprecatedString computed_values_json, DeprecatedString custom_properties_json)
+void InspectorWidget::load_style_json(StringView computed_values_json, StringView resolved_values_json, StringView custom_properties_json)
 {
-    m_selection_specified_values_json = specified_values_json;
-    m_computed_style_table_view->set_model(WebView::StylePropertiesModel::create(m_selection_specified_values_json.value().view()));
+    m_computed_style_table_view->set_model(WebView::StylePropertiesModel::create(computed_values_json));
     m_computed_style_table_view->set_searchable(true);
 
-    m_selection_computed_values_json = computed_values_json;
-    m_resolved_style_table_view->set_model(WebView::StylePropertiesModel::create(m_selection_computed_values_json.value().view()));
+    m_resolved_style_table_view->set_model(WebView::StylePropertiesModel::create(resolved_values_json));
     m_resolved_style_table_view->set_searchable(true);
 
-    m_selection_custom_properties_json = custom_properties_json;
-    m_custom_properties_table_view->set_model(WebView::StylePropertiesModel::create(m_selection_custom_properties_json.value().view()));
+    m_custom_properties_table_view->set_model(WebView::StylePropertiesModel::create(custom_properties_json));
     m_custom_properties_table_view->set_searchable(true);
 }
 
-void InspectorWidget::update_node_box_model(Optional<DeprecatedString> node_box_sizing_json)
+void InspectorWidget::update_node_box_model(StringView node_box_sizing_json)
 {
-    if (!node_box_sizing_json.has_value()) {
-        return;
-    }
-    auto json_or_error = JsonValue::from_string(node_box_sizing_json.value());
+    auto json_or_error = JsonValue::from_string(node_box_sizing_json);
     if (json_or_error.is_error() || !json_or_error.value().is_object()) {
         return;
     }
@@ -214,13 +203,8 @@ void InspectorWidget::clear_node_box_model()
 
 void InspectorWidget::clear_style_json()
 {
-    m_selection_specified_values_json.clear();
     m_computed_style_table_view->set_model(nullptr);
-
-    m_selection_computed_values_json.clear();
     m_resolved_style_table_view->set_model(nullptr);
-
-    m_selection_custom_properties_json.clear();
     m_custom_properties_table_view->set_model(nullptr);
 
     m_element_size_view->set_box_model({});
diff --git a/Userland/Applications/Browser/InspectorWidget.h b/Userland/Applications/Browser/InspectorWidget.h
index cc7fe8a7c0..16c85e39fb 100644
--- a/Userland/Applications/Browser/InspectorWidget.h
+++ b/Userland/Applications/Browser/InspectorWidget.h
@@ -9,12 +9,12 @@
 #pragma once
 
 #include "ElementSizePreviewWidget.h"
+#include <AK/String.h>
 #include <LibGUI/Widget.h>
 #include <LibWeb/CSS/Selector.h>
 #include <LibWeb/Forward.h>
 #include <LibWeb/Layout/BoxModelMetrics.h>
 #include <LibWebView/Forward.h>
-
 namespace Browser {
 
 class InspectorWidget final : public GUI::Widget {
@@ -29,20 +29,20 @@ public:
             return dom_node_id == other.dom_node_id && pseudo_element == other.pseudo_element;
         }
 
-        DeprecatedString to_deprecated_string() const
+        ErrorOr<String> to_string() const
         {
             if (pseudo_element.has_value())
-                return DeprecatedString::formatted("id: {}, pseudo: {}", dom_node_id, Web::CSS::pseudo_element_name(pseudo_element.value()));
-            return DeprecatedString::formatted("id: {}", dom_node_id);
+                return String::formatted("id: {}, pseudo: {}", dom_node_id, Web::CSS::pseudo_element_name(pseudo_element.value()));
+            return String::formatted("id: {}", dom_node_id);
         }
     };
 
     virtual ~InspectorWidget() = default;
 
     void set_web_view(NonnullRefPtr<WebView::OutOfProcessWebView> web_view) { m_web_view = web_view; }
-    void set_dom_json(DeprecatedString);
+    void set_dom_json(StringView);
     void clear_dom_json();
-    void set_dom_node_properties_json(Selection, DeprecatedString specified_values_json, DeprecatedString computed_values_json, DeprecatedString custom_properties_json, DeprecatedString node_box_sizing_json);
+    void set_dom_node_properties_json(Selection, StringView computed_values_json, StringView resolved_values_json, StringView custom_properties_json, StringView node_box_sizing_json);
 
     void set_selection(Selection);
     void select_default_node();
@@ -51,8 +51,8 @@ private:
     InspectorWidget();
 
     void set_selection(GUI::ModelIndex);
-    void load_style_json(DeprecatedString specified_values_json, DeprecatedString computed_values_json, DeprecatedString custom_properties_json);
-    void update_node_box_model(Optional<DeprecatedString> node_box_sizing_json);
+    void load_style_json(StringView computed_values_json, StringView resolved_values_json, StringView custom_properties_json);
+    void update_node_box_model(StringView node_box_sizing_json);
     void clear_style_json();
     void clear_node_box_model();
 
@@ -66,12 +66,9 @@ private:
 
     Web::Layout::BoxModelMetrics m_node_box_sizing;
 
-    Optional<DeprecatedString> m_dom_json;
     Optional<Selection> m_pending_selection;
     Selection m_selection;
-    Optional<DeprecatedString> m_selection_specified_values_json;
-    Optional<DeprecatedString> m_selection_computed_values_json;
-    Optional<DeprecatedString> m_selection_custom_properties_json;
+    bool m_dom_loaded { false };
 };
 
 }
diff --git a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
index b0bdce2ae7..3fce45a13d 100644
--- a/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
+++ b/Userland/Libraries/LibWebView/OutOfProcessWebView.cpp
@@ -416,10 +416,10 @@ void OutOfProcessWebView::notify_server_did_get_dom_tree(DeprecatedString const&
         on_get_dom_tree(dom_tree);
 }
 
-void OutOfProcessWebView::notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)
+void OutOfProcessWebView::notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)
 {
     if (on_get_dom_node_properties)
-        on_get_dom_node_properties(node_id, specified_style, computed_style, custom_properties, node_box_sizing);
+        on_get_dom_node_properties(node_id, computed_style, resolved_style, custom_properties, node_box_sizing);
 }
 
 void OutOfProcessWebView::notify_server_did_output_js_console_message(i32 message_index)
@@ -577,8 +577,8 @@ Optional<OutOfProcessWebView::DOMNodeProperties> OutOfProcessWebView::inspect_do
     if (!response.has_style())
         return {};
     return DOMNodeProperties {
-        .specified_values_json = response.specified_style(),
         .computed_values_json = response.computed_style(),
+        .resolved_values_json = response.resolved_style(),
         .custom_properties_json = response.custom_properties(),
         .node_box_sizing_json = response.node_box_sizing()
     };
diff --git a/Userland/Libraries/LibWebView/OutOfProcessWebView.h b/Userland/Libraries/LibWebView/OutOfProcessWebView.h
index ffb885e4bd..9fb0808ddc 100644
--- a/Userland/Libraries/LibWebView/OutOfProcessWebView.h
+++ b/Userland/Libraries/LibWebView/OutOfProcessWebView.h
@@ -44,8 +44,8 @@ public:
 
     void inspect_dom_tree();
     struct DOMNodeProperties {
-        DeprecatedString specified_values_json;
         DeprecatedString computed_values_json;
+        DeprecatedString resolved_values_json;
         DeprecatedString custom_properties_json;
         DeprecatedString node_box_sizing_json;
     };
@@ -96,7 +96,7 @@ public:
     Function<void(Web::DOM::Document*)> on_set_document;
     Function<void(const AK::URL&, DeprecatedString const&)> on_get_source;
     Function<void(DeprecatedString const&)> on_get_dom_tree;
-    Function<void(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)> on_get_dom_node_properties;
+    Function<void(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)> on_get_dom_node_properties;
     Function<void(i32 message_id)> on_js_console_new_message;
     Function<void(i32 start_index, Vector<DeprecatedString> const& message_types, Vector<DeprecatedString> const& messages)> on_get_js_console_messages;
     Function<Vector<Web::Cookie::Cookie>(AK::URL const& url)> on_get_all_cookies;
@@ -169,7 +169,7 @@ private:
     virtual void notify_server_did_request_dismiss_dialog(Badge<WebContentClient>) override;
     virtual void notify_server_did_get_source(const AK::URL& url, DeprecatedString const& source) override;
     virtual void notify_server_did_get_dom_tree(DeprecatedString const& dom_tree) override;
-    virtual void notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) override;
+    virtual void notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) override;
     virtual void notify_server_did_output_js_console_message(i32 message_index) override;
     virtual void notify_server_did_get_js_console_messages(i32 start_index, Vector<DeprecatedString> const& message_types, Vector<DeprecatedString> const& messages) override;
     virtual void notify_server_did_change_favicon(Gfx::Bitmap const& favicon) override;
diff --git a/Userland/Libraries/LibWebView/ViewImplementation.h b/Userland/Libraries/LibWebView/ViewImplementation.h
index eede9c8ef8..b7187e2190 100644
--- a/Userland/Libraries/LibWebView/ViewImplementation.h
+++ b/Userland/Libraries/LibWebView/ViewImplementation.h
@@ -49,7 +49,7 @@ public:
     virtual void notify_server_did_request_dismiss_dialog(Badge<WebContentClient>) = 0;
     virtual void notify_server_did_get_source(const AK::URL& url, DeprecatedString const& source) = 0;
     virtual void notify_server_did_get_dom_tree(DeprecatedString const& dom_tree) = 0;
-    virtual void notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) = 0;
+    virtual void notify_server_did_get_dom_node_properties(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) = 0;
     virtual void notify_server_did_output_js_console_message(i32 message_index) = 0;
     virtual void notify_server_did_get_js_console_messages(i32 start_index, Vector<DeprecatedString> const& message_types, Vector<DeprecatedString> const& messages) = 0;
     virtual void notify_server_did_change_favicon(Gfx::Bitmap const& favicon) = 0;
diff --git a/Userland/Libraries/LibWebView/WebContentClient.cpp b/Userland/Libraries/LibWebView/WebContentClient.cpp
index ee0ba762e3..6aa29a743e 100644
--- a/Userland/Libraries/LibWebView/WebContentClient.cpp
+++ b/Userland/Libraries/LibWebView/WebContentClient.cpp
@@ -161,9 +161,9 @@ void WebContentClient::did_get_dom_tree(DeprecatedString const& dom_tree)
     m_view.notify_server_did_get_dom_tree(dom_tree);
 }
 
-void WebContentClient::did_get_dom_node_properties(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)
+void WebContentClient::did_get_dom_node_properties(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing)
 {
-    m_view.notify_server_did_get_dom_node_properties(node_id, specified_style, computed_style, custom_properties, node_box_sizing);
+    m_view.notify_server_did_get_dom_node_properties(node_id, computed_style, resolved_style, custom_properties, node_box_sizing);
 }
 
 void WebContentClient::did_output_js_console_message(i32 message_index)
diff --git a/Userland/Libraries/LibWebView/WebContentClient.h b/Userland/Libraries/LibWebView/WebContentClient.h
index ffdbdfb7c9..08bf3f5900 100644
--- a/Userland/Libraries/LibWebView/WebContentClient.h
+++ b/Userland/Libraries/LibWebView/WebContentClient.h
@@ -53,7 +53,7 @@ private:
     virtual void did_request_image_context_menu(Gfx::IntPoint, AK::URL const&, DeprecatedString const&, unsigned, Gfx::ShareableBitmap const&) override;
     virtual void did_get_source(AK::URL const&, DeprecatedString const&) override;
     virtual void did_get_dom_tree(DeprecatedString const&) override;
-    virtual void did_get_dom_node_properties(i32 node_id, DeprecatedString const& specified_style, DeprecatedString const& computed_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) override;
+    virtual void did_get_dom_node_properties(i32 node_id, DeprecatedString const& computed_style, DeprecatedString const& resolved_style, DeprecatedString const& custom_properties, DeprecatedString const& node_box_sizing) override;
     virtual void did_output_js_console_message(i32 message_index) override;
     virtual void did_get_js_console_messages(i32 start_index, Vector<DeprecatedString> const& message_types, Vector<DeprecatedString> const& messages) override;
     virtual void did_change_favicon(Gfx::ShareableBitmap const&) override;
diff --git a/Userland/Services/WebContent/WebContentClient.ipc b/Userland/Services/WebContent/WebContentClient.ipc
index 455377b83c..6d57963904 100644
--- a/Userland/Services/WebContent/WebContentClient.ipc
+++ b/Userland/Services/WebContent/WebContentClient.ipc
@@ -37,7 +37,7 @@ endpoint WebContentClient
     did_request_dismiss_dialog() =|
     did_get_source(URL url, DeprecatedString source) =|
     did_get_dom_tree(DeprecatedString dom_tree) =|
-    did_get_dom_node_properties(i32 node_id, DeprecatedString specified_style, DeprecatedString computed_style, DeprecatedString custom_properties, DeprecatedString node_box_sizing_json) =|
+    did_get_dom_node_properties(i32 node_id, DeprecatedString computed_style, DeprecatedString resolved_style, DeprecatedString custom_properties, DeprecatedString node_box_sizing_json) =|
     did_change_favicon(Gfx::ShareableBitmap favicon) =|
     did_request_all_cookies(URL url) => (Vector<Web::Cookie::Cookie> cookies)
     did_request_named_cookie(URL url, DeprecatedString name) => (Optional<Web::Cookie::Cookie> cookie)
diff --git a/Userland/Services/WebContent/WebContentServer.ipc b/Userland/Services/WebContent/WebContentServer.ipc
index 91b5e29af4..55f5a43a1c 100644
--- a/Userland/Services/WebContent/WebContentServer.ipc
+++ b/Userland/Services/WebContent/WebContentServer.ipc
@@ -36,7 +36,7 @@ endpoint WebContentServer
     debug_request(DeprecatedString request, DeprecatedString argument) =|
     get_source() =|
     inspect_dom_tree() =|
-    inspect_dom_node(i32 node_id, Optional<Web::CSS::Selector::PseudoElement> pseudo_element) => (bool has_style, DeprecatedString specified_style, DeprecatedString computed_style, DeprecatedString custom_properties, DeprecatedString node_box_sizing)
+    inspect_dom_node(i32 node_id, Optional<Web::CSS::Selector::PseudoElement> pseudo_element) => (bool has_style, DeprecatedString computed_style,  DeprecatedString resolved_style,  DeprecatedString custom_properties, DeprecatedString node_box_sizing)
     get_hovered_node_id() => (i32 node_id)
     js_console_input(DeprecatedString js_source) =|
     js_console_request_messages(i32 start_index) =|