--- title: "What's new for the Microsoft Fluent UI Blazor library 5.0 RC1" url: https://daily.dev/posts/what-s-new-for-the-microsoft-fluent-ui-blazor-library-5-0-rc1-9f2cnamhv source_url: https://baaijte.net/blog/microsoft-fluentui-aspnetcore.components-50-rc1/ type: article source: "We Are .NET" published: 2026-02-28T23:42:37.090Z updated: 2026-02-28T23:43:22.161Z tags: [".net", "c#", "blazor", "web-components"] reading_time: 7 upvotes: 0 comments: 0 language: en --- > ## Documentation Index > Fetch the complete documentation index at: https://daily.dev/llms.txt > Use this file to discover all available pages before exploring further. # What's new for the Microsoft Fluent UI Blazor library 5.0 RC1 **[We Are .NET](https://daily.dev/sources/wearedotnet)** · 7 min read · 0 upvotes · 0 comments ## Summary Microsoft Fluent UI Blazor library v5 RC1 is now available, built on Fluent UI Web Components v3 — the same components powering Microsoft 365, Teams, and Windows 11. Key changes include a new area-based FluentLayout component for full-page layouts, a Default Values system for setting global component parameter defaults in Program.cs, and built-in localization support via IFluentLocalizer. The migration from v4 requires some code changes due to attribute name alignment with Fluent UI React, but documentation and an MCP server are provided to assist. Bundle size is reduced by dropping the legacy FAST dependency, and WCAG 2.1 AA accessibility compliance is included out of the box. ## Full article daily.dev links to this article rather than hosting it. Read it at the original source: ## Similar posts on daily.dev - [What's new for the Microsoft Fluent UI Blazor library 5.0 RC2](https://daily.dev/posts/what-s-new-for-the-microsoft-fluent-ui-blazor-library-5-0-rc2-cjyoftkfd) · We Are .NET · 1 upvotes · 0 comments --- Tags: [#.net](https://daily.dev/tags/.net), [#c#](https://daily.dev/tags/c#), [#blazor](https://daily.dev/tags/blazor), [#web-components](https://daily.dev/tags/web-components) [View this post on daily.dev](https://daily.dev/posts/what-s-new-for-the-microsoft-fluent-ui-blazor-library-5-0-rc1-9f2cnamhv)