diff --git a/pagetop-jquery/src/lib.rs b/pagetop-jquery/src/lib.rs
index 585a85a9..86e3c3d1 100644
--- a/pagetop-jquery/src/lib.rs
+++ b/pagetop-jquery/src/lib.rs
@@ -49,7 +49,7 @@ fn after_prepare_body(page: &mut Page) {
         page.context().alter(ContextOp::AddJavaScript(
             JavaScript::at("/jquery/jquery.min.js")
                 .with_version("3.6.0")
-                .with_weight(isize::MIN)
+                .with_weight(-99)
                 .with_mode(ModeJS::Normal),
         ));
     }
diff --git a/pagetop-megamenu/src/component.rs b/pagetop-megamenu/src/component.rs
index 9112593a..129b5f7f 100644
--- a/pagetop-megamenu/src/component.rs
+++ b/pagetop-megamenu/src/component.rs
@@ -23,7 +23,7 @@ pub enum MegaMenuItemType {
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct MegaMenuItem {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     item_type : MegaMenuItemType,
 }
@@ -37,7 +37,7 @@ impl ComponentTrait for MegaMenuItem {
         COMPONENT_MEGAMENUITEM
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -124,8 +124,8 @@ impl MegaMenuItem {
     // MegaMenuItem BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
@@ -151,7 +151,7 @@ actions_for_component!(MegaMenu);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct MegaMenu {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -172,7 +172,7 @@ impl ComponentTrait for MegaMenu {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -220,8 +220,8 @@ impl MegaMenu {
     // MegaMenu BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/anchor.rs b/pagetop-minimal/src/component/anchor.rs
index 0d041e21..b09b3e77 100644
--- a/pagetop-minimal/src/component/anchor.rs
+++ b/pagetop-minimal/src/component/anchor.rs
@@ -28,7 +28,7 @@ type AnchorHtml = OneComponent<L10n>;
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Anchor {
-    weight     : isize,
+    weight     : Weight,
     renderable : Renderable,
     id         : IdentifierValue,
     classes    : Classes,
@@ -54,7 +54,7 @@ impl ComponentTrait for Anchor {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -105,8 +105,8 @@ impl Anchor {
     // Anchor BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/block.rs b/pagetop-minimal/src/component/block.rs
index 956f64bf..f0e9264e 100644
--- a/pagetop-minimal/src/component/block.rs
+++ b/pagetop-minimal/src/component/block.rs
@@ -7,7 +7,7 @@ actions_for_component!(Block);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Block {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -29,7 +29,7 @@ impl ComponentTrait for Block {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -70,8 +70,8 @@ impl Block {
     }
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/container.rs b/pagetop-minimal/src/component/container.rs
index cdd98932..7bea787a 100644
--- a/pagetop-minimal/src/component/container.rs
+++ b/pagetop-minimal/src/component/container.rs
@@ -17,7 +17,7 @@ pub enum ContainerType {
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Container {
-    weight        : isize,
+    weight        : Weight,
     renderable    : Renderable,
     id            : IdentifierValue,
     classes       : Classes,
@@ -42,7 +42,7 @@ impl ComponentTrait for Container {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -125,8 +125,8 @@ impl Container {
     // Container BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/form_element/button.rs b/pagetop-minimal/src/component/form_element/button.rs
index d2977c84..df0130fe 100644
--- a/pagetop-minimal/src/component/form_element/button.rs
+++ b/pagetop-minimal/src/component/form_element/button.rs
@@ -15,7 +15,7 @@ type ButtonValue = OneComponent<L10n>;
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Button {
-    weight     : isize,
+    weight     : Weight,
     renderable : Renderable,
     classes    : Classes,
     button_type: ButtonType,
@@ -37,7 +37,7 @@ impl ComponentTrait for Button {
         COMPONENT_BUTTON
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -93,8 +93,8 @@ impl Button {
     // Button BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/form_element/date.rs b/pagetop-minimal/src/component/form_element/date.rs
index 2b097088..81e928fb 100644
--- a/pagetop-minimal/src/component/form_element/date.rs
+++ b/pagetop-minimal/src/component/form_element/date.rs
@@ -5,7 +5,7 @@ create_handle!(COMPONENT_DATE);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Date {
-    weight      : isize,
+    weight      : Weight,
     renderable  : Renderable,
     classes     : Classes,
     name        : AttributeValue,
@@ -32,7 +32,7 @@ impl ComponentTrait for Date {
         COMPONENT_DATE
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -78,8 +78,8 @@ impl Date {
     // Date BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/form_element/form.rs b/pagetop-minimal/src/component/form_element/form.rs
index a4299fa1..151c1180 100644
--- a/pagetop-minimal/src/component/form_element/form.rs
+++ b/pagetop-minimal/src/component/form_element/form.rs
@@ -14,7 +14,7 @@ pub enum FormMethod {
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Form {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -40,7 +40,7 @@ impl ComponentTrait for Form {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -79,8 +79,8 @@ impl Form {
     // Form BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/form_element/hidden.rs b/pagetop-minimal/src/component/form_element/hidden.rs
index c982e77e..925f143c 100644
--- a/pagetop-minimal/src/component/form_element/hidden.rs
+++ b/pagetop-minimal/src/component/form_element/hidden.rs
@@ -5,7 +5,7 @@ create_handle!(COMPONENT_HIDDEN);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Hidden {
-    weight: isize,
+    weight: Weight,
     name  : NameValue,
     value : AttributeValue,
 }
@@ -19,7 +19,7 @@ impl ComponentTrait for Hidden {
         COMPONENT_HIDDEN
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -39,8 +39,8 @@ impl Hidden {
     // Hidden BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/form_element/input.rs b/pagetop-minimal/src/component/form_element/input.rs
index 057048f4..af6ab03b 100644
--- a/pagetop-minimal/src/component/form_element/input.rs
+++ b/pagetop-minimal/src/component/form_element/input.rs
@@ -19,7 +19,7 @@ type InputHelpText = OneComponent<L10n>;
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Input {
-    weight      : isize,
+    weight      : Weight,
     renderable  : Renderable,
     classes     : Classes,
     input_type  : InputType,
@@ -52,7 +52,7 @@ impl ComponentTrait for Input {
         COMPONENT_INPUT
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -166,8 +166,8 @@ impl Input {
     // Input BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/grid/column.rs b/pagetop-minimal/src/component/grid/column.rs
index b872ccfa..8dd38a25 100644
--- a/pagetop-minimal/src/component/grid/column.rs
+++ b/pagetop-minimal/src/component/grid/column.rs
@@ -39,7 +39,7 @@ pub enum ColumnSize {
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Column {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -61,7 +61,7 @@ impl ComponentTrait for Column {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -90,8 +90,8 @@ impl Column {
     // Column BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/grid/row.rs b/pagetop-minimal/src/component/grid/row.rs
index ce9def7a..179c52e6 100644
--- a/pagetop-minimal/src/component/grid/row.rs
+++ b/pagetop-minimal/src/component/grid/row.rs
@@ -9,7 +9,7 @@ actions_for_component!(Row);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Row {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -30,7 +30,7 @@ impl ComponentTrait for Row {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -59,8 +59,8 @@ impl Row {
     // Row BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/heading.rs b/pagetop-minimal/src/component/heading.rs
index 4aeab75b..8e4de53f 100644
--- a/pagetop-minimal/src/component/heading.rs
+++ b/pagetop-minimal/src/component/heading.rs
@@ -30,7 +30,7 @@ type HeadingText = OneComponent<L10n>;
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Heading {
-    weight      : isize,
+    weight      : Weight,
     renderable  : Renderable,
     id          : IdentifierValue,
     classes     : Classes,
@@ -53,7 +53,7 @@ impl ComponentTrait for Heading {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -115,8 +115,8 @@ impl Heading {
     // Heading BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/icon.rs b/pagetop-minimal/src/component/icon.rs
index f6b162c0..2a77b600 100644
--- a/pagetop-minimal/src/component/icon.rs
+++ b/pagetop-minimal/src/component/icon.rs
@@ -5,7 +5,7 @@ create_handle!(COMPONENT_ICON);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Icon {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     icon_name : String,
     classes   : Classes,
@@ -20,7 +20,7 @@ impl ComponentTrait for Icon {
         COMPONENT_ICON
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -47,8 +47,8 @@ impl Icon {
     // Icon BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/image.rs b/pagetop-minimal/src/component/image.rs
index bd1287c5..72d7b351 100644
--- a/pagetop-minimal/src/component/image.rs
+++ b/pagetop-minimal/src/component/image.rs
@@ -5,7 +5,7 @@ create_handle!(COMPONENT_IMAGE);
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Image {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -26,7 +26,7 @@ impl ComponentTrait for Image {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -52,8 +52,8 @@ impl Image {
     // Image BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop-minimal/src/component/paragraph.rs b/pagetop-minimal/src/component/paragraph.rs
index 78f98687..0043689d 100644
--- a/pagetop-minimal/src/component/paragraph.rs
+++ b/pagetop-minimal/src/component/paragraph.rs
@@ -16,7 +16,7 @@ pub enum ParagraphDisplay {
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct Paragraph {
-    weight    : isize,
+    weight    : Weight,
     renderable: Renderable,
     id        : IdentifierValue,
     classes   : Classes,
@@ -38,7 +38,7 @@ impl ComponentTrait for Paragraph {
         self.id.get()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -66,8 +66,8 @@ impl Paragraph {
     // Paragraph BUILDER.
 
     #[fn_builder]
-    pub fn alter_weight(&mut self, weight: isize) -> &mut Self {
-        self.weight = weight;
+    pub fn alter_weight(&mut self, value: Weight) -> &mut Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop/src/core/action/definition.rs b/pagetop/src/core/action/definition.rs
index 0611879c..b302c797 100644
--- a/pagetop/src/core/action/definition.rs
+++ b/pagetop/src/core/action/definition.rs
@@ -1,4 +1,4 @@
-use crate::Handle;
+use crate::{Handle, Weight};
 
 use std::any::Any;
 
@@ -13,7 +13,7 @@ pub trait ActionTrait: BaseAction + Send + Sync {
 
     fn handle(&self) -> Handle;
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         0
     }
 }
diff --git a/pagetop/src/core/component.rs b/pagetop/src/core/component.rs
index 9e0ce62e..e479590f 100644
--- a/pagetop/src/core/component.rs
+++ b/pagetop/src/core/component.rs
@@ -32,7 +32,7 @@ macro_rules! actions_for_component {
 
             pub struct [<BeforePrepare $Component>] {
                 action: Option<[<Action $Component>]>,
-                weight: isize,
+                weight: Weight,
             }
 
             impl ActionTrait for [<BeforePrepare $Component>] {
@@ -47,7 +47,7 @@ macro_rules! actions_for_component {
                     [<ACTION_BEFORE_PREPARE_ $Component:upper>]
                 }
 
-                fn weight(&self) -> isize {
+                fn weight(&self) -> Weight {
                     self.weight
                 }
             }
@@ -60,8 +60,8 @@ macro_rules! actions_for_component {
                 }
 
                 #[allow(dead_code)]
-                pub fn with_weight(mut self, weight: isize) -> Self {
-                    self.weight = weight;
+                pub fn with_weight(mut self, value: Weight) -> Self {
+                    self.weight = value;
                     self
                 }
 
@@ -91,7 +91,7 @@ macro_rules! actions_for_component {
 
             pub struct [<AfterPrepare $Component>] {
                 action: Option<[<Action $Component>]>,
-                weight: isize,
+                weight: Weight,
             }
 
             impl ActionTrait for [<AfterPrepare $Component>] {
@@ -106,7 +106,7 @@ macro_rules! actions_for_component {
                     [<ACTION_AFTER_PREPARE_ $Component:upper>]
                 }
 
-                fn weight(&self) -> isize {
+                fn weight(&self) -> Weight {
                     self.weight
                 }
             }
@@ -119,8 +119,8 @@ macro_rules! actions_for_component {
                 }
 
                 #[allow(dead_code)]
-                pub fn with_weight(mut self, weight: isize) -> Self {
-                    self.weight = weight;
+                pub fn with_weight(mut self, value: Weight) -> Self {
+                    self.weight = value;
                     self
                 }
 
diff --git a/pagetop/src/core/component/definition.rs b/pagetop/src/core/component/definition.rs
index a431dc37..426ef76d 100644
--- a/pagetop/src/core/component/definition.rs
+++ b/pagetop/src/core/component/definition.rs
@@ -1,6 +1,6 @@
 use crate::core::component::Context;
 use crate::html::{html, Markup, PrepareMarkup};
-use crate::{util, Handle};
+use crate::{util, Handle, Weight};
 
 use std::any::Any;
 
@@ -31,7 +31,7 @@ pub trait ComponentTrait: BaseComponent + Send + Sync {
         None
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         0
     }
 
diff --git a/pagetop/src/core/theme/basic.rs b/pagetop/src/core/theme/basic.rs
index 7c196eae..2a581bec 100644
--- a/pagetop/src/core/theme/basic.rs
+++ b/pagetop/src/core/theme/basic.rs
@@ -30,7 +30,9 @@ impl ThemeTrait for Basic {
     fn before_prepare_body(&self, page: &mut Page) {
         page.alter_favicon(Some(Favicon::new().with_icon("/theme/favicon.ico")))
             .alter_context(ContextOp::AddStyleSheet(
-                StyleSheet::at("/theme/css/normalize.min.css").with_version("8.0.1"),
+                StyleSheet::at("/theme/css/normalize.min.css")
+                    .with_version("8.0.1")
+                    .with_weight(-99),
             ));
     }
 }
diff --git a/pagetop/src/html/assets.rs b/pagetop/src/html/assets.rs
index 2006dae7..92e91d9f 100644
--- a/pagetop/src/html/assets.rs
+++ b/pagetop/src/html/assets.rs
@@ -4,11 +4,12 @@ pub mod javascript;
 pub mod stylesheet;
 
 use crate::html::{html, Markup};
+use crate::Weight;
 
 pub trait AssetsTrait {
     fn path(&self) -> &str;
 
-    fn weight(&self) -> isize;
+    fn weight(&self) -> Weight;
 
     fn prepare(&self) -> Markup;
 }
diff --git a/pagetop/src/html/assets/headscript.rs b/pagetop/src/html/assets/headscript.rs
index ac384fbb..2cea8186 100644
--- a/pagetop/src/html/assets/headscript.rs
+++ b/pagetop/src/html/assets/headscript.rs
@@ -1,12 +1,13 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
+use crate::Weight;
 
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct HeadScript {
     path  : String,
     code  : String,
-    weight: isize,
+    weight: Weight,
 }
 
 impl AssetsTrait for HeadScript {
@@ -14,7 +15,7 @@ impl AssetsTrait for HeadScript {
         self.path.as_str()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -39,8 +40,8 @@ impl HeadScript {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }
 }
diff --git a/pagetop/src/html/assets/headstyles.rs b/pagetop/src/html/assets/headstyles.rs
index 5996eb05..9608d666 100644
--- a/pagetop/src/html/assets/headstyles.rs
+++ b/pagetop/src/html/assets/headstyles.rs
@@ -1,12 +1,13 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
+use crate::Weight;
 
 #[rustfmt::skip]
 #[derive(Default)]
 pub struct HeadStyles {
     path  : String,
     styles: String,
-    weight: isize,
+    weight: Weight,
 }
 
 impl AssetsTrait for HeadStyles {
@@ -14,7 +15,7 @@ impl AssetsTrait for HeadStyles {
         self.path.as_str()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -39,8 +40,8 @@ impl HeadStyles {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }
 }
diff --git a/pagetop/src/html/assets/javascript.rs b/pagetop/src/html/assets/javascript.rs
index f1242c47..e69a1ae1 100644
--- a/pagetop/src/html/assets/javascript.rs
+++ b/pagetop/src/html/assets/javascript.rs
@@ -1,5 +1,6 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
+use crate::Weight;
 
 #[derive(Default, Eq, PartialEq)]
 pub enum ModeJS {
@@ -15,7 +16,7 @@ pub struct JavaScript {
     path   : String,
     prefix : &'static str,
     version: &'static str,
-    weight : isize,
+    weight : Weight,
     mode   : ModeJS,
 }
 
@@ -24,7 +25,7 @@ impl AssetsTrait for JavaScript {
         self.path.as_str()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -59,8 +60,8 @@ impl JavaScript {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop/src/html/assets/stylesheet.rs b/pagetop/src/html/assets/stylesheet.rs
index 2acc0d5d..2cc53a1e 100644
--- a/pagetop/src/html/assets/stylesheet.rs
+++ b/pagetop/src/html/assets/stylesheet.rs
@@ -1,5 +1,6 @@
 use crate::html::assets::AssetsTrait;
 use crate::html::{html, Markup};
+use crate::Weight;
 
 pub enum TargetMedia {
     Default,
@@ -15,7 +16,7 @@ pub struct StyleSheet {
     prefix : &'static str,
     version: &'static str,
     media  : Option<&'static str>,
-    weight : isize,
+    weight : Weight,
 }
 
 impl AssetsTrait for StyleSheet {
@@ -23,7 +24,7 @@ impl AssetsTrait for StyleSheet {
         self.path.as_str()
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 
@@ -57,8 +58,8 @@ impl StyleSheet {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop/src/prelude.rs b/pagetop/src/prelude.rs
index a3fd2241..a51eb062 100644
--- a/pagetop/src/prelude.rs
+++ b/pagetop/src/prelude.rs
@@ -1,9 +1,10 @@
 //! The PageTop Prelude.
 
-// Re-exports.
-pub use crate::{
-    concat_string, fn_builder, paste, Handle, HashMapResources, LazyStatic, ResultExt,
-};
+// Re-exported macros.
+pub use crate::{concat_string, fn_builder, paste};
+
+// Global.
+pub use crate::{Handle, HashMapResources, LazyStatic, ResultExt, Weight};
 
 // Funciones y macros útiles.
 pub use crate::util;
@@ -11,7 +12,7 @@ pub use crate::{action, actions_for_component};
 pub use crate::{create_handle, default_settings, kv};
 pub use crate::{serve_static_files, static_files, static_locales};
 
-// *************************************************************************************************
+// API.
 
 pub use crate::config;
 
diff --git a/pagetop/src/response/page/action/after_prepare_body.rs b/pagetop/src/response/page/action/after_prepare_body.rs
index 941d6f52..719d7752 100644
--- a/pagetop/src/response/page/action/after_prepare_body.rs
+++ b/pagetop/src/response/page/action/after_prepare_body.rs
@@ -1,13 +1,13 @@
 use crate::core::action::{action_ref, run_actions, ActionTrait};
 use crate::response::page::action::ActionPage;
 use crate::response::page::Page;
-use crate::{create_handle, Handle};
+use crate::{create_handle, Handle, Weight};
 
 create_handle!(ACTION_AFTER_PREPARE_BODY for Action);
 
 pub struct ActionAfterPrepareBody {
     action: Option<ActionPage>,
-    weight: isize,
+    weight: Weight,
 }
 
 impl ActionTrait for ActionAfterPrepareBody {
@@ -22,7 +22,7 @@ impl ActionTrait for ActionAfterPrepareBody {
         ACTION_AFTER_PREPARE_BODY
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 }
@@ -33,8 +33,8 @@ impl ActionAfterPrepareBody {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }
 
diff --git a/pagetop/src/response/page/action/before_prepare_body.rs b/pagetop/src/response/page/action/before_prepare_body.rs
index 8971e51a..0c8d7907 100644
--- a/pagetop/src/response/page/action/before_prepare_body.rs
+++ b/pagetop/src/response/page/action/before_prepare_body.rs
@@ -1,13 +1,13 @@
 use crate::core::action::{action_ref, run_actions, ActionTrait};
 use crate::response::page::action::ActionPage;
 use crate::response::page::Page;
-use crate::{create_handle, Handle};
+use crate::{create_handle, Handle, Weight};
 
 create_handle!(ACTION_BEFORE_PREPARE_BODY for Action);
 
 pub struct ActionBeforePrepareBody {
     action: Option<ActionPage>,
-    weight: isize,
+    weight: Weight,
 }
 
 impl ActionTrait for ActionBeforePrepareBody {
@@ -22,7 +22,7 @@ impl ActionTrait for ActionBeforePrepareBody {
         ACTION_BEFORE_PREPARE_BODY
     }
 
-    fn weight(&self) -> isize {
+    fn weight(&self) -> Weight {
         self.weight
     }
 }
@@ -33,8 +33,8 @@ impl ActionBeforePrepareBody {
         self
     }
 
-    pub fn with_weight(mut self, weight: isize) -> Self {
-        self.weight = weight;
+    pub fn with_weight(mut self, value: Weight) -> Self {
+        self.weight = value;
         self
     }