diff --git a/guides/asset_management.md b/guides/asset_management.md
index 77c3a763cd..9d9c27979a 100644
--- a/guides/asset_management.md
+++ b/guides/asset_management.md
@@ -94,7 +94,7 @@ If you need to reference other directories, you need to update the arguments abo
If you import a Node package that depends on additional fonts or images, you might find them to fail to load. This is because they are referenced in the JS or CSS but by default Esbuild will not touch or process referenced files. You can add arguments to esbuild in `config/config.exs` to ensure that the referenced resources are copied to the output folder. The following example would copy all referenced font files to the output folder and prefix the paths with `/assets/`:
```elixir
-args: ~w(js/app.js --bundle --target=es2017 --outdir=../priv/static/assets --external:/fonts/* --external:/images/* --public-path=/assets/ --loader:.woff=copy --loader:.ttf=copy --loader:.eot=copy --loader:.woff2=copy),
+args: ~w(js/app.js --bundle --target=es2017 --outdir=../priv/static/assets --external:/fonts/* --external:/images/* --public-path=/assets/ --loader:.woff=copy --loader:.ttf=copy --loader:.eot=copy --loader:.woff2=copy),
```
For more information, see [the esbuild documentation](https://esbuild.github.io/content-types/#copy).
diff --git a/guides/howto/custom_error_pages.md b/guides/howto/custom_error_pages.md
index a1a965f360..9b922dc429 100644
--- a/guides/howto/custom_error_pages.md
+++ b/guides/howto/custom_error_pages.md
@@ -90,7 +90,7 @@ Phoenix generates an `ErrorHTML` for us, but it doesn't give us a `lib/hello_web
Welcome to Phoenix!
-
+
diff --git a/guides/real_time/channels.md b/guides/real_time/channels.md
index 4fb2e303a8..ac1c5a4a86 100644
--- a/guides/real_time/channels.md
+++ b/guides/real_time/channels.md
@@ -432,7 +432,7 @@ Next, we need to pass this token to JavaScript. We can do so inside a script tag
```heex
-
+
```
### Step 4 - Pass the Token to the Socket Constructor and Verify
diff --git a/installer/templates/phx_single/config/config.exs b/installer/templates/phx_single/config/config.exs
index 11496cdbc4..b9a256f647 100644
--- a/installer/templates/phx_single/config/config.exs
+++ b/installer/templates/phx_single/config/config.exs
@@ -37,8 +37,16 @@ config :<%= @app_name %>, <%= @app_module %>.Mailer, adapter: Swoosh.Adapters.Lo
config :esbuild,
version: "0.25.4",
<%= @app_name %>: [
- args:
- ~w(js/app.js --bundle --target=es2022 --outdir=../priv/static/assets/js --external:/fonts/* --external:/images/* --alias:@=.),
+ args: ~w(
+ js/app.js
+ --bundle
+ --format=esm
+ --target=es2022
+ --outdir=../priv/static/assets/js
+ --external:/fonts/*
+ --external:/images/*
+ --alias:@=.
+ ),
cd: Path.expand("..<%= if @in_umbrella, do: "/apps/#{@app_name}" %>/assets", __DIR__),
env: %{"NODE_PATH" => [Path.expand("../deps", __DIR__), Mix.Project.build_path()]}
]<% end %><%= if @css do %>
diff --git a/installer/templates/phx_umbrella/apps/app_name_web/config/config.exs b/installer/templates/phx_umbrella/apps/app_name_web/config/config.exs
index dc0792d165..48060b5b3e 100644
--- a/installer/templates/phx_umbrella/apps/app_name_web/config/config.exs
+++ b/installer/templates/phx_umbrella/apps/app_name_web/config/config.exs
@@ -21,8 +21,16 @@ config :<%= @web_app_name %>, <%= @endpoint_module %>,
config :esbuild,
version: "0.25.4",
<%= @web_app_name %>: [
- args:
- ~w(js/app.js --bundle --target=es2022 --outdir=../priv/static/assets/js --external:/fonts/* --external:/images/* --alias:@=.),
+ args: ~w(
+ js/app.js
+ --bundle
+ --format=esm
+ --target=es2022
+ --outdir=../priv/static/assets/js
+ --external:/fonts/*
+ --external:/images/*
+ --alias:@=.
+ ),
cd: Path.expand("../apps/<%= @web_app_name %>/assets", __DIR__),
env: %{"NODE_PATH" => [Path.expand("../deps", __DIR__), Mix.Project.build_path()]}
]<% end %><%= if @css do %>
diff --git a/installer/templates/phx_web/components/layouts/root.html.heex b/installer/templates/phx_web/components/layouts/root.html.heex
index 1a57c4899b..6c8d739518 100644
--- a/installer/templates/phx_web/components/layouts/root.html.heex
+++ b/installer/templates/phx_web/components/layouts/root.html.heex
@@ -9,7 +9,7 @@
<%= if not @css do %>
<% end %>
- <%= if @css do %>