[5.0] IE11 support for server-side Blazor

[guardrex]

HOLD for engineering work on: dotnet/aspnetcore#9436

---

Document Details

⚠ Do not edit this section. It is required for docs.microsoft.com ➟ GitHub issue linking.

• ID: c7957ff6-5b09-31dd-17dd-2bf3660a8ebd
• Version Independent ID: b03c3cec-a3de-d563-d0f8-45fabfb39758
• Content: ASP.NET Core Blazor supported platforms
• Content Source: aspnetcore/blazor/supported-platforms.md
• Product: aspnet-core
• Technology: aspnetcore-blazor
• GitHub Login: @guardrex
• Microsoft Alias: riande

[mkArtakMSFT]

We should just add a sentence somewhere "to use Blazor Server with older browsers like IE11 we recommend using the community maintained Blazor Polyfills".

This can potentially go into the Browser Support Matrix article.

[guardrex]

This can potentially go into the Browser Support Matrix article.

It's already there. 👍

This issue remains open/on-hold to react to the result of engineering work.

[guardrex]

Since dotnet/aspnetcore#9436 was closed as a won't fix (or won't fix further, i.e., polyfills work) and the supported versions topic already has a statement about using polyfills, we can close this.