diff --git a/packages/yew-macro/src/html_tree/html_element.rs b/packages/yew-macro/src/html_tree/html_element.rs
index a1aadbda7e2..62b5fd231fe 100644
--- a/packages/yew-macro/src/html_tree/html_element.rs
+++ b/packages/yew-macro/src/html_tree/html_element.rs
@@ -370,17 +370,19 @@ impl ToTokens for HtmlElement {
         tokens.extend(match &name {
             TagName::Lit(dashedname) => {
                 let name_span = dashedname.span();
-                let name = dashedname.to_ascii_lowercase_string();
+                let name = dashedname.to_string();
+                let lowercase_name = dashedname.to_ascii_lowercase_string();
                 if !is_normalised_element_name(&dashedname.to_string()) {
                     emit_warning!(
                         name_span.clone(),
                         format!(
-                            "The tag '{dashedname}' is not matching its normalized form '{name}'. If you want \
+                            "The tag '{dashedname}' is not matching its normalized form '{lowercase_name}'. If you want \
                              to keep this form, change this to a dynamic tag `@{{\"{dashedname}\"}}`."
                         )
                     )
                 }
-                let node = match &*name {
+                // Use lowercase for compile-time checks but preserve original casing in output
+                let node = match &*lowercase_name {
                     "input" => {
                         let value = value();
                         let checked = checked();
diff --git a/packages/yew/src/virtual_dom/vtag.rs b/packages/yew/src/virtual_dom/vtag.rs
index 96875e0ae38..33021d9dcfa 100644
--- a/packages/yew/src/virtual_dom/vtag.rs
+++ b/packages/yew/src/virtual_dom/vtag.rs
@@ -158,8 +158,9 @@ impl VTag {
     /// Creates a new [VTag] instance with `tag` name (cannot be changed later in DOM).
     pub fn new(tag: impl Into<AttrValue>) -> Self {
         let tag = tag.into();
+        let lowercase_tag = tag.to_ascii_lowercase();
         Self::new_base(
-            match &*tag.to_ascii_lowercase() {
+            match &*lowercase_tag {
                 "input" => VTagInner::Input(Default::default()),
                 "textarea" => VTagInner::Textarea(Default::default()),
                 _ => VTagInner::Other {
@@ -537,7 +538,8 @@ mod feat_ssr {
                     let _ = w.write_str("</textarea>");
                 }
                 VTagInner::Other { tag, children } => {
-                    if !VOID_ELEMENTS.contains(&tag.as_ref()) {
+                    let lowercase_tag = tag.to_ascii_lowercase();
+                    if !VOID_ELEMENTS.contains(&lowercase_tag.as_ref()) {
                         children
                             .render_into_stream(w, parent_scope, hydratable, tag.into())
                             .await;