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In Blazor, an input field with type="email" incorrectly converts extended ASCII characters in Google Chrome #55632

Closed mark-storefeeder closed 5 months ago

mark-storefeeder commented 5 months ago

Is there an existing issue for this?

Describe the bug

In a Blazor project, given the following Razor code:

<input @bind-value="TextValue" type="email" />
<br />
@TextValue

@code {
    public string TextValue { get; set; }
}

In Google Chrome, when you enter certain strings which include extended ASCII characters AFTER the @ sign in the email address, the bound value isn't what you'd expect

For example, when you enter a@£, when the field loses focus the bound value is shown as a@xn--9a.

image

This seems to be Chrome only - the same thing does NOT happen in Firefox.

Windows 11 Enterprise 23H2, Google Chrome 124.0.6367.91.

Expected Behavior

The bound value should be the same as the value that's been typed - so if the user types a@£ then the bound value should be a@£.

Steps To Reproduce

  1. Create a new empty Blazor WASM project.

  2. Add the following markup and code to the home page:

    <input @bind-value="TextValue" type="email" />
<br />
@TextValue

@code {
    public string TextValue { get; set; }
}
  3. Run the application in Chrome.
  4. Enter a@£ in the input field and tab or click out of the field so it loses focus.
  5. Note that the bound value is displayed as a@xn--9a when it should be displayed as a@£.

Exceptions (if any)

No response

.NET Version

8.0.204

Anything else?

dotnet --info output:

.NET SDK:
 Version:           8.0.204
 Commit:            c338c7548c
 Workload version:  8.0.200-manifests.7d36c14f

Runtime Environment:
 OS Name:     Windows
 OS Version:  10.0.22631
 OS Platform: Windows
 RID:         win-x64
 Base Path:   C:\Program Files\dotnet\sdk\8.0.204\

.NET workloads installed:
 [android]
   Installation Source: VS 17.9.34728.123
   Manifest Version:    34.0.52/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.android\34.0.52\WorkloadManifest.json
   Install Type:        FileBased

 [maccatalyst]
   Installation Source: VS 17.9.34728.123
   Manifest Version:    17.2.8004/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.maccatalyst\17.2.8004\WorkloadManifest.json
   Install Type:        FileBased

 [ios]
   Installation Source: VS 17.9.34728.123
   Manifest Version:    17.2.8004/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.ios\17.2.8004\WorkloadManifest.json
   Install Type:        FileBased

 [wasm-tools]
   Installation Source: VS 17.9.34728.123
   Manifest Version:    8.0.4/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.workload.mono.toolchain.current\8.0.4\WorkloadManifest.json
   Install Type:        FileBased

 [maui-windows]
   Installation Source: VS 17.9.34728.123
   Manifest Version:    8.0.7/8.0.100
   Manifest Path:       C:\Program Files\dotnet\sdk-manifests\8.0.100\microsoft.net.sdk.maui\8.0.7\WorkloadManifest.json
   Install Type:        FileBased

Host:
  Version:      8.0.4
  Architecture: x64
  Commit:       2d7eea2529

.NET SDKs installed:
  2.2.207 [C:\Program Files\dotnet\sdk]
  3.1.426 [C:\Program Files\dotnet\sdk]
  5.0.214 [C:\Program Files\dotnet\sdk]
  5.0.408 [C:\Program Files\dotnet\sdk]
  6.0.103 [C:\Program Files\dotnet\sdk]
  6.0.321 [C:\Program Files\dotnet\sdk]
  8.0.204 [C:\Program Files\dotnet\sdk]

.NET runtimes installed:
  Microsoft.AspNetCore.All 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.All]
  Microsoft.AspNetCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.3 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 6.0.29 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 7.0.18 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.AspNetCore.App 8.0.4 [C:\Program Files\dotnet\shared\Microsoft.AspNetCore.App]
  Microsoft.NETCore.App 2.1.30 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 2.2.8 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.3 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 6.0.29 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 7.0.18 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.NETCore.App 8.0.4 [C:\Program Files\dotnet\shared\Microsoft.NETCore.App]
  Microsoft.WindowsDesktop.App 3.1.32 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 5.0.17 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.3 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.15 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.26 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 6.0.29 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 7.0.18 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]
  Microsoft.WindowsDesktop.App 8.0.4 [C:\Program Files\dotnet\shared\Microsoft.WindowsDesktop.App]

Other architectures found:
  x86   [C:\Program Files (x86)\dotnet]
    registered at [HKLM\SOFTWARE\dotnet\Setup\InstalledVersions\x86\InstallLocation]

Environment variables:
  Not set

global.json file:
  Not found

Learn more:
  https://aka.ms/dotnet/info

Download .NET:
  https://aka.ms/dotnet/download
javiercn commented 5 months ago

@mark-storefeeder thanks for contacting us.

Does this happen in an SSR form or when the app is running interactively. Also, does this happen in any previous version?

mark-storefeeder commented 5 months ago

@javiercn I don't know how to test the SSR / interactive scenario, but I'm happy to take a look if you can explain how.

All I know is that it happens in an off-the-shelf Blazor WASM application.

It seems to happen in at least .NET 6, 7 and 8.

I've seen it in a few production applications, including our own, Telerik's REPL (example) and MudBlazor (example).

mkArtakMSFT commented 5 months ago

Thanks for contacting us. What you're observing here is a browser behavior which converts characters which aren't valid for hostnames to a Punycode character set. You can learn more about this in https://en.wikipedia.org/wiki/Punycode.