Question 1

How does Blazor.Polyfill compare to using polyfill.io for IE11 support?

Accepted Answer

Blazor.Polyfill is specifically tailored for Blazor Server, dynamically transpiling blazor.server.js and providing integrated polyfills, while polyfill.io is a general-purpose service that might not handle Blazor's specific JavaScript and WebSocket needs without extra configuration, as noted for Telerik components.

Question 2

How to enable JavaScript module import emulation with Blazor.Polyfill?

Accepted Answer

Install the BlazorPolyfill.Build NuGet package, set up NPM, place modules in /wwwroot/js/modules, and enable JavascriptModuleImportEmulation in Startup.cs, but be aware of limitations like case sensitivity and the need to compute relative paths for non-rooted URLs.

Question 3

Does Blazor.Polyfill work with Blazor WebAssembly?

Accepted Answer

No, Blazor.Polyfill is designed only for Blazor Server applications; for WebAssembly, you'd need different approaches like client-side polyfills or transpilation tools, as it runs entirely in the browser without server-side rendering.

Question 4

What are the performance impacts of using Blazor.Polyfill?

Accepted Answer

It adds overhead through dynamic JavaScript transpilation and polyfill loading, which can slow down initial page loads and increase bandwidth usage, especially on older browsers with limited processing power or slower network connections.

Question 5

Can I use Blazor.Polyfill with Telerik UI for Blazor on IE11?

Accepted Answer

Yes, but you may need additional polyfills for features like IntersectionObserver, as mentioned in the README, requiring extra scripts from services like polyfill.io to ensure full functionality of third-party components.

Question 6

How to troubleshoot Blazor.Polyfill on unsupported platforms like ARM64 Linux?

Accepted Answer

Use the UsePackagedBlazorServerLibrary option to bypass dynamic transpilation, but this means you won't benefit from automatic updates and might face compatibility issues with newer Blazor versions, as detailed in the recommendations section.

Blazor.Polyfill

What is Blazor.Polyfill?

Overview

Use Cases

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Related Projects

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Pros & Cons

Pros

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Frequently Asked Questions