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Clarify ImportMap component sections #35229

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guardrex merged 1 commit into from
Apr 15, 2025
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Clarify ImportMap component sections #35229

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4 changes: 3 additions & 1 deletion aspnetcore/blazor/fundamentals/static-files.md
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Expand Up @@ -66,7 +66,7 @@ Assets are delivered via the <xref:Microsoft.AspNetCore.Components.ComponentBase

## `ImportMap` component

*This section applies to server-side Blazor apps.*
*This section applies to Blazor Web Apps that call <xref:Microsoft.AspNetCore.Builder.RazorComponentsEndpointRouteBuilderExtensions.MapRazorComponents%2A>.*

The `ImportMap` component (<xref:Microsoft.AspNetCore.Components.ImportMap>) represents an import map element (`<script type="importmap"></script>`) that defines the import map for module scripts. The Import Map component is placed in `<head>` content of the root component, typically the `App` component (`Components/App.razor`).

Expand Down Expand Up @@ -190,6 +190,8 @@ The preceding code results in the following import map:

## Import map Content Security Policy (CSP) violations

*This section applies to Blazor Web Apps that call <xref:Microsoft.AspNetCore.Builder.RazorComponentsEndpointRouteBuilderExtensions.MapRazorComponents%2A>.*

The `ImportMap` component is rendered as an inline `<script>` tag, which violates a strict [Content Security Policy (CSP)](https://developer.mozilla.org/docs/Web/HTTP/Guides/CSP) that sets the `default-src` or `script-src` directive.

For examples of how to address the policy violation with Subresource Integrity (SRI) or a cryptographic nonce, see [Resolving CSP violations with Subresource Integrity (SRI) or a nonce](xref:blazor/security/content-security-policy#resolving-csp-violations-with-subresource-integrity-sri-or-a-cryptographic-nonce).
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