how-to-forcefully-set-ies-compatibility-mode-off-from-the-server-side

Question

how-to-forcefully-set-ies-compatibility-mode-off-from-the-server-side

Arti Shukla 0

Hi,

I have an application that opens in Edge wih IE mode due to organization policy. From that application we open Blazor application in new tab/window. Due to redirection it also opens in Edge with IE mode and Blazor does'nt wor in IE mode.

Please help how should i override policy and open Blazor in normal Edge mode

ShiJieLi-MSFT 12,326 Reputation points Microsoft External Staff

2024-01-01T03:07:20.1466667+00:00

Hi @Arti Shukla ,

May I know if you have resolved this problem?

2 answers

Your answer

ShiJieLi-MSFT 12,326 Reputation points Microsoft External Staff

2024-01-01T03:07:20.1466667+00:00

Hi @Arti Shukla ,

May I know if you have resolved this problem?

Answer 1

AgaveJoe 30,036

You can try adding the following line to the head tag in the App.razor page.

https://stackoverflow.com/questions/6771258/what-does-meta-http-equiv-x-ua-compatible-content-ie-edge-do

<meta http-equiv="X-UA-Compatible" content="IE=Edge" />

Example

<head>
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <base href="/" />
    <link rel="stylesheet" href="bootstrap/bootstrap.min.css" />
    <link rel="stylesheet" href="app.css" />
    <link rel="stylesheet" href="BlazorWebAssembly.styles.css" />
    <link rel="icon" type="image/png" href="favicon.png" />
    <HeadOutlet />
</head>

I'm not sure if this will override policy. Meeting with your administrator and explaining the problem is better course of action in my opinion.

Rob Ainscough 31 Reputation points

2025-04-24T22:41:20.3766667+00:00

Unfortunately using the http-equiv meta tag does NOT work ... or partially works (visually still a mess). I've been trying to solve the problem where a link from a legacy web app that runs under Edge/IE compatibility to my Blazor-Server web app. Tried the _Host.cshtml and App.razor in the Head section and still not working.
AgaveJoe 30,036 Reputation points

2025-04-25T10:04:20.96+00:00

Just to clarify regarding Edge compatibility mode, because Edge is a desktop application, web applications like Blazor don't have the ability to directly control its settings. One common approach to try and encourage Edge to use its most recent rendering engine is to include the <meta http-equiv="X-UA-Compatible" content="IE=Edge" /> tag within your HTML's <head> section. After implementing this, did you check if compatibility mode is still engaged? It's also a good idea to inspect the rendered HTML in your browser's developer tools to ensure this meta tag is actually present. Lastly, knowing which Blazor flavor you're working with (Server, WebAssembly, or Hybrid) might be helpful for further assistance.
Rob Ainscough 31 Reputation points

2025-04-25T16:54:36.07+00:00

@AgaveJoe as I posted, tried the meta tag with content setting in my Blazor app and it did nothing, still stuck in compatibility mode. Odd Edge has a setting to define specific URLs are running in compatibility mode, BUT had no settings for specific URLs to run in standard/Default Edge? Seems like a huge oversight from Microsoft ... how do they expect a legacy compatibility mode app to link to a modern Blazor app?? It's currently impossible with Edge. As it stands now, we have to manually tell users to switch OUT of compatibility mode (huge support issue) when they link to Blazor app. We're looking into alternatives that would load Chrome when a link is clicked from legacy app, but I can't imagine that's something Microsoft wants to happen?

Answer 2

ShiJieLi-MSFT 12,326 Microsoft External Staff

Hi @Arti Shukla ,

You can specify your Blazor app URL to open in Edge mode by modifying the IE mode site list:

  <site url="https://yourBlazorAppURL.com">
    <compat-mode>Default</compat-mode>
    <open-in allow-redirect="true">MSEdge</open-in>
  </site>

<open-in allow-redirect="true">MSEdge</open-in> specifies that if the URL is encountered in a redirect chain in Microsoft Edge, it will be opened in Microsoft Edge mode, instead of IE mode.

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Best Regards,

Shijie Li

Rob Ainscough 31 Reputation points

2025-04-24T22:45:20.28+00:00

Hi @ShiJieLi-MSFT

Your suggestion looks interesting where are you defining the <site> ... </site> settings? In the legacy/compatibility mode call linking the Blazor app?

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how-to-forcefully-set-ies-compatibility-mode-off-from-the-server-side

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