diff --git a/pagetop/Cargo.toml b/pagetop/Cargo.toml
index ded5f7f1..5c6b9530 100644
--- a/pagetop/Cargo.toml
+++ b/pagetop/Cargo.toml
@@ -40,6 +40,7 @@ itoa          = "1.0.9"
 nom           = "7.1.3"
 once_cell     = "1.18.0"
 paste         = "1.0.14"
+smart-default = "0.7.1"
 substring     = "1.4.5"
 term_size     = "0.3.2"
 toml          = "0.8.8"
diff --git a/pagetop/src/base/component.rs b/pagetop/src/base/component.rs
index ca3f5594..2064d0b4 100644
--- a/pagetop/src/base/component.rs
+++ b/pagetop/src/base/component.rs
@@ -1,6 +1,6 @@
 use crate::core::component::{Context, ContextOp};
 use crate::html::{JavaScript, StyleSheet};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 // Context parameters.
 pub const PARAM_BASE_WEIGHT: &str = "base.weight";
@@ -57,7 +57,7 @@ pub(crate) fn add_base_assets(cx: &mut Context) {
 // *************************************************************************************************
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum BreakPoint {
     #[default]
     None,  /* Does not apply. Rest initially assume 1 pixel = 0.0625em */
@@ -88,7 +88,7 @@ impl ToString for BreakPoint {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum FontSize {
     ExtraLarge,
     XxLarge,
diff --git a/pagetop/src/base/component/block.rs b/pagetop/src/base/component/block.rs
index ab23a726..976d3c96 100644
--- a/pagetop/src/base/component/block.rs
+++ b/pagetop/src/base/component/block.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Block {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/branding.rs b/pagetop/src/base/component/branding.rs
index d5149d25..f14430d0 100644
--- a/pagetop/src/base/component/branding.rs
+++ b/pagetop/src/base/component/branding.rs
@@ -1,31 +1,19 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
+#[derive(SmartDefault)]
 pub struct Branding {
     id        : OptionId,
     weight    : Weight,
     renderable: Renderable,
+    #[default(_code = "config::SETTINGS.app.name.to_owned()")]
     app_name  : String,
     slogan    : OptionTranslated,
-    logo      : ArcTypedComponent<Image>,
+    logo      : OptionComponent<Image>,
+    #[default(_code = "|_| \"/\"")]
     frontpage : FnContextualPath,
 }
 
-#[rustfmt::skip]
-impl Default for Branding {
-    fn default() -> Self {
-        Branding {
-            id        : OptionId::default(),
-            weight    : Weight::default(),
-            renderable: Renderable::default(),
-            app_name  : config::SETTINGS.app.name.to_owned(),
-            slogan    : OptionTranslated::default(),
-            logo      : ArcTypedComponent::<Image>::default(),
-            frontpage : |_| "/",
-        }
-    }
-}
-
 impl_handle!(COMPONENT_BASE_BRANDING for Branding);
 
 impl ComponentTrait for Branding {
diff --git a/pagetop/src/base/component/button.rs b/pagetop/src/base/component/button.rs
index 88e5917d..57d5f6dc 100644
--- a/pagetop/src/base/component/button.rs
+++ b/pagetop/src/base/component/button.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ButtonType {
     #[default]
     Link,
@@ -17,7 +17,7 @@ impl ToString for ButtonType {
     }
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ButtonTarget {
     #[default]
     Default,
@@ -27,10 +27,8 @@ pub enum ButtonTarget {
     Context(String),
 }
 
-type ButtonIcon = ArcTypedComponent<Icon>;
-
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Button {
     id         : OptionId,
     weight     : Weight,
diff --git a/pagetop/src/base/component/flex.rs b/pagetop/src/base/component/flex.rs
index 2eb2a78f..29bed8ec 100644
--- a/pagetop/src/base/component/flex.rs
+++ b/pagetop/src/base/component/flex.rs
@@ -7,7 +7,7 @@ use crate::prelude::*;
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum Direction {
     #[default]
     Default,
@@ -42,7 +42,7 @@ impl ToString for Direction {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum WrapAlign {
     #[default]
     Default,
@@ -65,7 +65,7 @@ impl ToString for WrapAlign {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ContentAlign {
     #[default]
     Default,
@@ -94,7 +94,7 @@ impl ToString for ContentAlign {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ContentJustify {
     #[default]
     Default,
@@ -123,7 +123,7 @@ impl ToString for ContentJustify {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemAlign {
     #[default]
     Default,
@@ -150,7 +150,7 @@ impl ToString for ItemAlign {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum Gap {
     #[default]
     Default,
@@ -175,7 +175,7 @@ impl ToString for Gap {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemGrow {
     #[default]
     Default,
@@ -210,7 +210,7 @@ impl ToString for ItemGrow {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemShrink {
     #[default]
     Default,
@@ -245,7 +245,7 @@ impl ToString for ItemShrink {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemSize {
     #[default]
     Default,
@@ -284,7 +284,7 @@ impl ToString for ItemSize {
 
 // *************************************************************************************************
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemOffset {
     #[default]
     Default,
diff --git a/pagetop/src/base/component/flex/container.rs b/pagetop/src/base/component/flex/container.rs
index 83912eec..e4c04de8 100644
--- a/pagetop/src/base/component/flex/container.rs
+++ b/pagetop/src/base/component/flex/container.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Container {
     id             : OptionId,
     weight         : Weight,
diff --git a/pagetop/src/base/component/flex/item.rs b/pagetop/src/base/component/flex/item.rs
index 35808918..b0131090 100644
--- a/pagetop/src/base/component/flex/item.rs
+++ b/pagetop/src/base/component/flex/item.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Item {
     id           : OptionId,
     weight       : Weight,
diff --git a/pagetop/src/base/component/form/button.rs b/pagetop/src/base/component/form/button.rs
index e64c3fc1..a24f290f 100644
--- a/pagetop/src/base/component/form/button.rs
+++ b/pagetop/src/base/component/form/button.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ButtonType {
     #[default]
     Button,
@@ -20,7 +20,7 @@ impl ToString for ButtonType {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Button {
     weight     : Weight,
     renderable : Renderable,
diff --git a/pagetop/src/base/component/form/date.rs b/pagetop/src/base/component/form/date.rs
index 08b47e40..7893c5a6 100644
--- a/pagetop/src/base/component/form/date.rs
+++ b/pagetop/src/base/component/form/date.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Date {
     weight      : Weight,
     renderable  : Renderable,
diff --git a/pagetop/src/base/component/form/form_main.rs b/pagetop/src/base/component/form/form_main.rs
index e0ee24fa..6565d22e 100644
--- a/pagetop/src/base/component/form/form_main.rs
+++ b/pagetop/src/base/component/form/form_main.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum FormMethod {
     #[default]
     Post,
@@ -8,7 +8,7 @@ pub enum FormMethod {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Form {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/form/hidden.rs b/pagetop/src/base/component/form/hidden.rs
index 9a809295..f774317c 100644
--- a/pagetop/src/base/component/form/hidden.rs
+++ b/pagetop/src/base/component/form/hidden.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Hidden {
     weight: Weight,
     name  : OptionName,
diff --git a/pagetop/src/base/component/form/input.rs b/pagetop/src/base/component/form/input.rs
index 4e8ec54e..b5d906d7 100644
--- a/pagetop/src/base/component/form/input.rs
+++ b/pagetop/src/base/component/form/input.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum InputType {
     #[default]
     Textfield,
@@ -12,7 +12,7 @@ pub enum InputType {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Input {
     weight      : Weight,
     renderable  : Renderable,
diff --git a/pagetop/src/base/component/heading.rs b/pagetop/src/base/component/heading.rs
index e4ccbbe5..181e9b6a 100644
--- a/pagetop/src/base/component/heading.rs
+++ b/pagetop/src/base/component/heading.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum HeadingType {
     #[default]
     H1,
@@ -11,7 +11,7 @@ pub enum HeadingType {
     H6,
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum HeadingDisplay {
     ExtraLarge,
     XxLarge,
@@ -39,7 +39,7 @@ impl ToString for HeadingDisplay {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Heading {
     id          : OptionId,
     weight      : Weight,
diff --git a/pagetop/src/base/component/html.rs b/pagetop/src/base/component/html.rs
index 7105e715..0d7e04f8 100644
--- a/pagetop/src/base/component/html.rs
+++ b/pagetop/src/base/component/html.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Html(Markup);
 
 impl_handle!(COMPONENT_BASE_HTML for Html);
diff --git a/pagetop/src/base/component/icon.rs b/pagetop/src/base/component/icon.rs
index 8257fdfe..ffb028e7 100644
--- a/pagetop/src/base/component/icon.rs
+++ b/pagetop/src/base/component/icon.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Icon {
     weight    : Weight,
     renderable: Renderable,
diff --git a/pagetop/src/base/component/image.rs b/pagetop/src/base/component/image.rs
index 0c404944..360c01e8 100644
--- a/pagetop/src/base/component/image.rs
+++ b/pagetop/src/base/component/image.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 const IMG_FLUID: &str = "pt-img__fluid";
 const IMG_FIXED: &str = "pt-img__fixed";
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ImageSize {
     #[default]
     Auto,
@@ -14,7 +14,7 @@ pub enum ImageSize {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Image {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/menu/element.rs b/pagetop/src/base/component/menu/element.rs
index c7f6181d..c01c0f49 100644
--- a/pagetop/src/base/component/menu/element.rs
+++ b/pagetop/src/base/component/menu/element.rs
@@ -5,7 +5,7 @@ use super::Submenu;
 type Content = ArcTypedComponent<Html>;
 type SubmenuItems = ArcTypedComponent<Submenu>;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ElementType {
     #[default]
     Void,
@@ -16,7 +16,7 @@ pub enum ElementType {
 // Element.
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Element {
     weight      : Weight,
     renderable  : Renderable,
diff --git a/pagetop/src/base/component/menu/group.rs b/pagetop/src/base/component/menu/group.rs
index de88ccb2..906cb638 100644
--- a/pagetop/src/base/component/menu/group.rs
+++ b/pagetop/src/base/component/menu/group.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 use super::Element;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Group {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/menu/item.rs b/pagetop/src/base/component/menu/item.rs
index 13b10e9e..ff50696a 100644
--- a/pagetop/src/base/component/menu/item.rs
+++ b/pagetop/src/base/component/menu/item.rs
@@ -7,7 +7,7 @@ type Content = ArcTypedComponent<Html>;
 type SubmenuItems = ArcTypedComponent<Submenu>;
 type MegamenuGroups = ArcTypedComponent<Megamenu>;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum ItemType {
     #[default]
     Void,
@@ -22,7 +22,7 @@ pub enum ItemType {
 // Item.
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Item {
     weight     : Weight,
     renderable : Renderable,
diff --git a/pagetop/src/base/component/menu/megamenu.rs b/pagetop/src/base/component/menu/megamenu.rs
index c7a1783f..7ec224d9 100644
--- a/pagetop/src/base/component/menu/megamenu.rs
+++ b/pagetop/src/base/component/menu/megamenu.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 use super::Group;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Megamenu {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/menu/menu_main.rs b/pagetop/src/base/component/menu/menu_main.rs
index ac053b67..a670be8a 100644
--- a/pagetop/src/base/component/menu/menu_main.rs
+++ b/pagetop/src/base/component/menu/menu_main.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 use super::Item;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Menu {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/menu/submenu.rs b/pagetop/src/base/component/menu/submenu.rs
index d8743e6a..caf3f1ec 100644
--- a/pagetop/src/base/component/menu/submenu.rs
+++ b/pagetop/src/base/component/menu/submenu.rs
@@ -3,7 +3,7 @@ use crate::prelude::*;
 use super::Item;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Submenu {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/paragraph.rs b/pagetop/src/base/component/paragraph.rs
index caa41443..2ff74fd7 100644
--- a/pagetop/src/base/component/paragraph.rs
+++ b/pagetop/src/base/component/paragraph.rs
@@ -1,7 +1,7 @@
 use crate::prelude::*;
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Paragraph {
     id        : OptionId,
     weight    : Weight,
diff --git a/pagetop/src/base/component/powered_by.rs b/pagetop/src/base/component/powered_by.rs
index 4e87dd70..0f0991b5 100644
--- a/pagetop/src/base/component/powered_by.rs
+++ b/pagetop/src/base/component/powered_by.rs
@@ -11,7 +11,7 @@ pub enum PoweredByLogo {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct PoweredBy {
     weight    : Weight,
     renderable: Renderable,
diff --git a/pagetop/src/base/component/translate.rs b/pagetop/src/base/component/translate.rs
index dd41c215..b32b1b64 100644
--- a/pagetop/src/base/component/translate.rs
+++ b/pagetop/src/base/component/translate.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Translate(L10n);
 
 impl_handle!(COMPONENT_BASE_TRANSLATE for Translate);
diff --git a/pagetop/src/base/component/wrapper.rs b/pagetop/src/base/component/wrapper.rs
index 4102fb44..25fa7eff 100644
--- a/pagetop/src/base/component/wrapper.rs
+++ b/pagetop/src/base/component/wrapper.rs
@@ -1,6 +1,6 @@
 use crate::prelude::*;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum WrapperType {
     #[default]
     Container,
@@ -11,7 +11,7 @@ pub enum WrapperType {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Wrapper {
     id           : OptionId,
     weight       : Weight,
diff --git a/pagetop/src/core/action/list.rs b/pagetop/src/core/action/list.rs
index 12a75ec8..617e9b95 100644
--- a/pagetop/src/core/action/list.rs
+++ b/pagetop/src/core/action/list.rs
@@ -1,10 +1,11 @@
 use crate::core::action::ActionTrait;
+use crate::SmartDefault;
 
 use std::sync::{Arc, RwLock};
 
 pub type Action = Box<dyn ActionTrait>;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct ActionsList(Arc<RwLock<Vec<Action>>>);
 
 impl ActionsList {
diff --git a/pagetop/src/core/component/renderable.rs b/pagetop/src/core/component/renderable.rs
index 27d630eb..2b0dcb68 100644
--- a/pagetop/src/core/component/renderable.rs
+++ b/pagetop/src/core/component/renderable.rs
@@ -1,19 +1,14 @@
 use crate::core::component::Context;
+use crate::SmartDefault;
 
 pub type FnIsRenderable = fn(cx: &Context) -> bool;
 
+#[derive(SmartDefault)]
 pub struct Renderable {
+    #[default(_code = "render_always")]
     pub check: FnIsRenderable,
 }
 
-impl Default for Renderable {
-    fn default() -> Self {
-        Renderable {
-            check: render_always,
-        }
-    }
-}
-
 fn render_always(_cx: &Context) -> bool {
     true
 }
diff --git a/pagetop/src/core/theme/regions.rs b/pagetop/src/core/theme/regions.rs
index 548185bd..688a6553 100644
--- a/pagetop/src/core/theme/regions.rs
+++ b/pagetop/src/core/theme/regions.rs
@@ -1,6 +1,6 @@
 use crate::core::component::{AnyComponents, ArcAnyComponent, ArcAnyOp};
 use crate::core::theme::ThemeRef;
-use crate::{Handle, LazyStatic};
+use crate::{Handle, LazyStatic, SmartDefault};
 
 use std::collections::HashMap;
 use std::sync::RwLock;
@@ -11,7 +11,7 @@ static THEME_REGIONS: LazyStatic<RwLock<HashMap<Handle, ComponentsRegions>>> =
 static COMMON_REGIONS: LazyStatic<RwLock<ComponentsRegions>> =
     LazyStatic::new(|| RwLock::new(ComponentsRegions::default()));
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct ComponentsRegions(HashMap<&'static str, AnyComponents>);
 
 impl ComponentsRegions {
diff --git a/pagetop/src/html/assets.rs b/pagetop/src/html/assets.rs
index 92e91d9f..503fbcf9 100644
--- a/pagetop/src/html/assets.rs
+++ b/pagetop/src/html/assets.rs
@@ -4,7 +4,7 @@ pub mod javascript;
 pub mod stylesheet;
 
 use crate::html::{html, Markup};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 pub trait AssetsTrait {
     fn path(&self) -> &str;
@@ -14,7 +14,7 @@ pub trait AssetsTrait {
     fn prepare(&self) -> Markup;
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Assets<T>(Vec<T>);
 
 impl<T: AssetsTrait> Assets<T> {
diff --git a/pagetop/src/html/assets/headscript.rs b/pagetop/src/html/assets/headscript.rs
index 51c649ce..ec7d6390 100644
--- a/pagetop/src/html/assets/headscript.rs
+++ b/pagetop/src/html/assets/headscript.rs
@@ -1,9 +1,9 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct HeadScript {
     path  : String,
     code  : String,
diff --git a/pagetop/src/html/assets/headstyles.rs b/pagetop/src/html/assets/headstyles.rs
index 1a00430e..ecdd01e9 100644
--- a/pagetop/src/html/assets/headstyles.rs
+++ b/pagetop/src/html/assets/headstyles.rs
@@ -1,9 +1,9 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct HeadStyles {
     path  : String,
     styles: String,
diff --git a/pagetop/src/html/assets/javascript.rs b/pagetop/src/html/assets/javascript.rs
index 526ab412..dbe54d43 100644
--- a/pagetop/src/html/assets/javascript.rs
+++ b/pagetop/src/html/assets/javascript.rs
@@ -1,6 +1,6 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 #[derive(Default, Eq, PartialEq)]
 pub enum ModeJS {
@@ -11,7 +11,7 @@ pub enum ModeJS {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct JavaScript {
     path   : String,
     prefix : &'static str,
diff --git a/pagetop/src/html/assets/stylesheet.rs b/pagetop/src/html/assets/stylesheet.rs
index b670f21e..3974010c 100644
--- a/pagetop/src/html/assets/stylesheet.rs
+++ b/pagetop/src/html/assets/stylesheet.rs
@@ -1,6 +1,6 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
-use crate::Weight;
+use crate::{SmartDefault, Weight};
 
 pub enum TargetMedia {
     Default,
@@ -10,7 +10,7 @@ pub enum TargetMedia {
 }
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct StyleSheet {
     path   : String,
     prefix : &'static str,
diff --git a/pagetop/src/html/favicon.rs b/pagetop/src/html/favicon.rs
index 651b476b..490e98ce 100644
--- a/pagetop/src/html/favicon.rs
+++ b/pagetop/src/html/favicon.rs
@@ -1,6 +1,7 @@
 use crate::html::{html, Markup};
+use crate::SmartDefault;
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct Favicon(Vec<Markup>);
 
 impl Favicon {
diff --git a/pagetop/src/html/opt_classes.rs b/pagetop/src/html/opt_classes.rs
index e92ccf3e..acddcf50 100644
--- a/pagetop/src/html/opt_classes.rs
+++ b/pagetop/src/html/opt_classes.rs
@@ -9,7 +9,7 @@
 //! **OptionClasses** assumes that the order of the classes is irrelevant
 //! (<https://stackoverflow.com/a/1321712>), and duplicate classes will not be allowed.
 
-use crate::fn_builder;
+use crate::{fn_builder, SmartDefault};
 
 pub enum ClassesOp {
     Add,
@@ -20,7 +20,7 @@ pub enum ClassesOp {
     Clear,
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct OptionClasses(Vec<String>);
 
 impl OptionClasses {
diff --git a/pagetop/src/html/opt_id.rs b/pagetop/src/html/opt_id.rs
index 22cd8e69..2022f16d 100644
--- a/pagetop/src/html/opt_id.rs
+++ b/pagetop/src/html/opt_id.rs
@@ -1,6 +1,6 @@
-use crate::fn_builder;
+use crate::{fn_builder, SmartDefault};
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct OptionId(Option<String>);
 
 impl OptionId {
diff --git a/pagetop/src/html/opt_name.rs b/pagetop/src/html/opt_name.rs
index d253e7e3..84c665a8 100644
--- a/pagetop/src/html/opt_name.rs
+++ b/pagetop/src/html/opt_name.rs
@@ -1,6 +1,6 @@
-use crate::fn_builder;
+use crate::{fn_builder, SmartDefault};
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct OptionName(Option<String>);
 
 impl OptionName {
diff --git a/pagetop/src/html/opt_string.rs b/pagetop/src/html/opt_string.rs
index d81abdb0..c1f55ebd 100644
--- a/pagetop/src/html/opt_string.rs
+++ b/pagetop/src/html/opt_string.rs
@@ -1,6 +1,6 @@
-use crate::fn_builder;
+use crate::{fn_builder, SmartDefault};
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct OptionString(Option<String>);
 
 impl OptionString {
diff --git a/pagetop/src/html/opt_translated.rs b/pagetop/src/html/opt_translated.rs
index 722db440..400170fc 100644
--- a/pagetop/src/html/opt_translated.rs
+++ b/pagetop/src/html/opt_translated.rs
@@ -1,9 +1,8 @@
-use crate::fn_builder;
 use crate::html::Markup;
 use crate::locale::{L10n, LanguageIdentifier};
+use crate::{fn_builder, SmartDefault};
 
-#[derive(Default)]
-
+#[derive(SmartDefault)]
 pub struct OptionTranslated(L10n);
 
 impl OptionTranslated {
diff --git a/pagetop/src/html/unit.rs b/pagetop/src/html/unit.rs
index 44371fa3..1c3bdffe 100644
--- a/pagetop/src/html/unit.rs
+++ b/pagetop/src/html/unit.rs
@@ -1,4 +1,4 @@
-use crate::concat_string;
+use crate::{concat_string, SmartDefault};
 
 // About pixels: Pixels (px) are relative to the viewing device. For low-dpi devices, 1px is one
 // device pixel (dot) of the display. For printers and high resolution screens 1px implies multiple
@@ -10,7 +10,7 @@ use crate::concat_string;
 // About viewport: If the browser window size is 50cm wide, 1vw = 0.5cm.
 
 #[rustfmt::skip]
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub enum Value {
     #[default]
     None,
diff --git a/pagetop/src/lib.rs b/pagetop/src/lib.rs
index 43772bbe..0192aa7c 100644
--- a/pagetop/src/lib.rs
+++ b/pagetop/src/lib.rs
@@ -101,7 +101,7 @@
 #![cfg_attr(docsrs, feature(doc_cfg))]
 
 // *************************************************************************************************
-// RE-EXPORTED MACROS.
+// RE-EXPORTED MACROS AND DERIVES.
 // *************************************************************************************************
 
 pub use concat_string::concat_string;
@@ -109,6 +109,10 @@ pub use concat_string::concat_string;
 /// Enables flexible identifier concatenation in macros, allowing new items with pasted identifiers.
 pub use paste::paste;
 
+/// Custom derive for automatically implementing the [Default](std::default::Default) trait with
+/// customized default values.
+pub use smart_default::SmartDefault;
+
 pub use pagetop_macros::{fn_builder, main, test};
 
 // *************************************************************************************************
diff --git a/pagetop/src/locale.rs b/pagetop/src/locale.rs
index de2e1b8d..00833845 100644
--- a/pagetop/src/locale.rs
+++ b/pagetop/src/locale.rs
@@ -88,7 +88,7 @@
 //! ```
 
 use crate::html::{Markup, PreEscaped};
-use crate::{config, kv, LazyStatic, LOCALES_PAGETOP};
+use crate::{config, kv, LazyStatic, SmartDefault, LOCALES_PAGETOP};
 
 pub use fluent_templates;
 pub use unic_langid::LanguageIdentifier;
@@ -169,7 +169,7 @@ macro_rules! static_locales {
     };
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 enum L10nOp {
     #[default]
     None,
@@ -177,7 +177,7 @@ enum L10nOp {
     Translate(String),
 }
 
-#[derive(Default)]
+#[derive(SmartDefault)]
 pub struct L10n {
     op: L10nOp,
     locales: Option<&'static Locales>,
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index 1ac38762..7f517184 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -1,7 +1,7 @@
 //! The PageTop Prelude.
 
-// Re-exported macros.
-pub use crate::{concat_string, fn_builder, main, paste, test};
+// Re-exported macros and derives.
+pub use crate::{concat_string, fn_builder, main, paste, test, SmartDefault};
 
 // Global.
 pub use crate::{Handle, HasHandle, HashMapResources, LazyStatic, Weight};