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Blazor static asset delivery and fingerprinting #33010

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Jul 9, 2024
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Blazor static asset delivery and fingerprinting #33010

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Blazor static asset delivery and fingerprinting
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24 changes: 22 additions & 2 deletions aspnetcore/blazor/components/class-libraries.md
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Expand Up @@ -173,10 +173,30 @@ Add a page to the app that uses the `ExtraStyles` component from the RCL.
<ExtraStyles />
```

Link to the library's stylesheet in the app's `<head>` markup ([location of `<head>` content](xref:blazor/project-structure#location-of-head-and-body-content)).
Link to the library's stylesheet in the app's `<head>` markup ([location of `<head>` content](xref:blazor/project-structure#location-of-head-and-body-content)):

:::moniker-end

:::moniker range=">= aspnetcore-9.0"

Blazor Web Apps:

```html
<link href="@Assets["_content/ComponentLibrary/additionalStyles.css"]" rel="stylesheet">
```

Standalone Blazor WebAssembly apps:

```html
<link href="_content/ComponentLibrary/additionalStyles.css" rel="stylesheet">
```

:::moniker-end

:::moniker range=">= aspnetcore-6.0 < aspnetcore-9.0"

```html
<link href="_content/ComponentLibrary/additionalStyles.css" rel="stylesheet" />
<link href="_content/ComponentLibrary/additionalStyles.css" rel="stylesheet">
```

:::moniker-end
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26 changes: 24 additions & 2 deletions aspnetcore/blazor/components/css-isolation.md
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Expand Up @@ -51,12 +51,34 @@ h1 {

## CSS isolation bundling

CSS isolation occurs at build time. Blazor rewrites CSS selectors to match markup rendered by the component. The rewritten CSS styles are bundled and produced as a static asset. The stylesheet is referenced inside the `<head>` tag ([location of `<head>` content](xref:blazor/project-structure#location-of-head-and-body-content)). The following `<link>` element is added by default to an app created from the Blazor project templates, where the placeholder `{ASSEMBLY NAME}` is the project's assembly name:
CSS isolation occurs at build time. Blazor rewrites CSS selectors to match markup rendered by the component. The rewritten CSS styles are bundled and produced as a static asset. The stylesheet is referenced inside the `<head>` tag ([location of `<head>` content](xref:blazor/project-structure#location-of-head-and-body-content)). The following `<link>` element is added by default to an app created from the Blazor project templates:

:::moniker range=">= aspnetcore-9.0"

Blazor Web Apps:

```html
<link href="@Assets["{ASSEMBLY NAME}.styles.css"]" rel="stylesheet">
```

Standalone Blazor WebAssembly apps:

```html
<link href="{ASSEMBLY NAME}.styles.css" rel="stylesheet">
```

:::moniker-end

:::moniker range="< aspnetcore-9.0"

```html
<link href="{ASSEMBLY NAME}.styles.css" rel="stylesheet">
```

:::moniker-end

The `{ASSEMBLY NAME}` placeholder is the project's assembly name.

:::moniker range="< aspnetcore-8.0"

The following example is from a hosted Blazor WebAssembly **:::no-loc text="Client":::** app. The app's assembly name is `BlazorSample.Client`, and the `<link>` is added by the Blazor WebAssembly project template when the project is created with the Hosted option (`-ho|--hosted` option using the .NET CLI or **ASP.NET Core Hosted** checkbox using Visual Studio):
Expand Down Expand Up @@ -90,7 +112,7 @@ At build time, a project bundle is created with the convention `obj/{CONFIGURATI

## Child component support

By default, CSS isolation only applies to the component you associate with the format `{COMPONENT NAME}.razor.css`, where the placeholder `{COMPONENT NAME}` is usually the component name. To apply changes to a child component, use the `::deep` [pseudo-element](https://developer.mozilla.org/docs/Web/CSS/Pseudo-elements) to any descendant elements in the parent component's `.razor.css` file. The `::deep` pseudo-element selects elements that are *descendants* of an element's generated scope identifier.
By default, CSS isolation only applies to the component you associate with the format `{COMPONENT NAME}.razor.css`, where the `{COMPONENT NAME}` placeholder is usually the component name. To apply changes to a child component, use the `::deep` [pseudo-element](https://developer.mozilla.org/docs/Web/CSS/Pseudo-elements) to any descendant elements in the parent component's `.razor.css` file. The `::deep` pseudo-element selects elements that are *descendants* of an element's generated scope identifier.

The following example shows a parent component called `Parent` with a child component called `Child`.

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80 changes: 64 additions & 16 deletions aspnetcore/blazor/components/integration.md
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Expand Up @@ -92,6 +92,8 @@ Add an `App` component to the app, which serves as the root component, which is

`Components/App.razor`:

:::moniker range=">= aspnetcore-9.0"

```razor
<!DOCTYPE html>
<html lang="en">
Expand All @@ -100,7 +102,7 @@ Add an `App` component to the app, which serves as the root component, which is
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<base href="/" />
<link rel="stylesheet" href="BlazorSample.styles.css" />
<link rel="stylesheet" href="@Assets["{ASSEMBLY NAME}.styles.css"]" />
<HeadOutlet />
</head>

Expand All @@ -112,12 +114,34 @@ Add an `App` component to the app, which serves as the root component, which is
</html>
```

For the `<link>` element in the preceding example, change `BlazorSample` in the stylesheet's file name to match the app's project name. For example, a project named `ContosoApp` uses the `ContosoApp.styles.css` stylesheet file name:
:::moniker-end

```html
<link rel="stylesheet" href="ContosoApp.styles.css" />
:::moniker range="< aspnetcore-9.0"

```razor
<!DOCTYPE html>
<html lang="en">

<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<base href="/" />
<link rel="stylesheet" href="{ASSEMBLY NAME}.styles.css" />
<HeadOutlet />
</head>

<body>
<Routes />
<script src="_framework/blazor.web.js"></script>
</body>

</html>
```

:::moniker-end

The `{ASSEMBLY NAME}` placeholder is the app's assembly name. For example, a project with an assembly name of `ContosoApp` uses the `ContosoApp.styles.css` stylesheet file name.

Add a `Pages` folder to the `Components` folder to hold routable Razor components.

Add the following `Welcome` component to demonstrate static SSR.
Expand Down Expand Up @@ -739,16 +763,18 @@ Add an `App` component to the `Components` folder with the following content.

`Components/App.razor`:

:::moniker range=">= aspnetcore-9.0"

```razor
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>{APP TITLE}</title>
<link rel="stylesheet" href="/lib/bootstrap/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="/css/site.css" />
<link rel="stylesheet" href="/{APP NAMESPACE}.styles.css" />
<link rel="stylesheet" href="@Assets["lib/bootstrap/dist/css/bootstrap.min.css"]" />
<link rel="stylesheet" href="@Assets["css/site.css"]" />
<link rel="stylesheet" href="@Assets["{APP NAMESPACE}.styles.css"]" />
<HeadOutlet />
</head>
<body>
Expand All @@ -761,19 +787,41 @@ Add an `App` component to the `Components` folder with the following content.
</html>
```

In the preceding code update the app title and stylesheet file name:
:::moniker-end

* For the `{APP TITLE}` placeholder in the `<title>` element, set the app's title. For example:
:::moniker range="< aspnetcore-9.0"

```html
<title>Blazor Sample</title>
```
```razor
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>{APP TITLE}</title>
<link rel="stylesheet" href="lib/bootstrap/dist/css/bootstrap.min.css" />
<link rel="stylesheet" href="css/site.css" />
<link rel="stylesheet" href="{APP NAMESPACE}.styles.css" />
<HeadOutlet />
</head>
<body>
<Routes />
<script src="/lib/jquery/dist/jquery.min.js"></script>
<script src="/lib/bootstrap/dist/js/bootstrap.bundle.min.js"></script>
<script src="/js/site.js"></script>
<script src="_framework/blazor.web.js"></script>
</body>
</html>
```

* For the `{APP NAMESPACE}` placeholder in the stylesheet `<link>` element, set the app's namespace. For example:
:::moniker-end

```html
<link rel="stylesheet" href="/BlazorSample.styles.css" />
```
The `{APP NAMESPACE}` placeholder is the app's namespace.

The `{APP TITLE}` placeholder in the `<title>` element is the app's title. For example:

```html
<title>Blazor Sample</title>
```

Where services are registered, add services for Razor components and services to support rendering Interactive Server components.

Expand Down
2 changes: 1 addition & 1 deletion aspnetcore/blazor/fundamentals/environments.md
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Expand Up @@ -128,7 +128,7 @@ For more information on Blazor startup, see <xref:blazor/fundamentals/startup>.

Blazor WebAssembly apps can set the environment with the `blazor-environment` header.

In the following example for IIS, the custom header (`blazor-environment`) is added to the published `web.config` file. The `web.config` file is located in the `bin/Release/{TARGET FRAMEWORK}/publish` folder, where the placeholder `{TARGET FRAMEWORK}` is the target framework:
In the following example for IIS, the custom header (`blazor-environment`) is added to the published `web.config` file. The `web.config` file is located in the `bin/Release/{TARGET FRAMEWORK}/publish` folder, where the `{TARGET FRAMEWORK}` placeholder is the target framework:

```xml
<?xml version="1.0" encoding="UTF-8"?>
Expand Down
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