Fission 0.10.1: Static site and SSR parity

August 10, 2026

Fission 0.10.1 aligns the framework's Static site and SSR shells around one document contract. Pages rendered during a build and pages rendered for a request now share the same configuration for themes, generated design systems, packaged fonts, favicons, syntax highlighting, custom CSS, trusted document elements, structured data, and retained Fission footers.

let site = FissionSite::new()
    .with_design_system::<ProductDesignSystem>(DesignMode::Light)
    .favicon("/assets/icon.svg")
    .head_html("<meta name=\"product\" content=\"catalog\">")
    .footer_widget::<AppState, _>(ProductFooter);

let server = FissionServerApp::new("Product")
    .with_design_system::<ProductDesignSystem>(DesignMode::Light)
    .favicon("/assets/icon.svg")
    .head_html("<meta name=\"product\" content=\"catalog\">")
    .footer_widget::<AppState, _>(ProductFooter);

Both APIs delegate these browser-document concerns to the new DocumentShellConfig, preventing the two HTML targets from acquiring separate theme, asset, or integration behavior.

Static site improvements

Static routes gain build-time equivalents for features that previously existed only in SSR:

•

i18n(...), translation_bundle(...), default_locale(...), and locale_resolver(...);

•

locale-aware document_metadata(...);

•

route_widget_with_state(...) for build-time route data;

•

with_route_structured_data(...) for custom JSON-LD;

•

browser surface registrations and portals preserved in generated output.

Markdown and MDX locale front matter now controls translation resolution, lang, and og:locale without relying on a language-specific URL prefix. The old documentation-site-specific /es rule has been removed.

SSR improvements

SSR gains the document features that previously worked only during Static site generation:

•

with_design_system(...) and with_fonts(...), including generated @font-face CSS;

•

favicon(...) and conditional code_highlighting(...);

•

footer_widget(...) with the same retained widget semantics as Static site.

SSR continues to own request-specific behavior—sessions, signed actions, dynamic parameters, cache and revalidation policy, response status, workers, and islands. Static site continues to own build-specific behavior such as content discovery, generated search files, redirects, sitemap and robots files, and link checking.

Compatibility

Fission 0.10.1 is a patch release. Existing FissionSite and FissionServerApp builders continue to work; the release adds aligned APIs and routes existing document behavior through the shared configuration layer.

Update the relevant shell features together when an application supports both outputs:

fission = { version = "0.10.1", default-features = false, features = ["site", "server"] }

Older post

Fission 0.10.0: native surfaces, reliable presentation, and a unified product site

Newer post

Fission 0.11.0: One text-input contract

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