net481 
namespace Microsoft.AspNetCore.Razor.Language
{
    public static class TestTagHelperDescriptorBuilderExtensions
    {
        public static TagHelperDescriptorBuilder! AllowedChildTag(this TagHelperDescriptorBuilder! builder, string! tagName, Action<AllowedChildTagDescriptorBuilder!>? configure = null);
    }
}
.NET Framework
4.7.24.84.8.1
Information specific to net481
Assembly

Microsoft.AspNetCore.Razor.Test.Common , Version=10.4.0.0, PublicKeyToken=adb9793829ddae60

Referencing

Your project needs a package reference to Microsoft.AspNetCore.Razor.Test.Common.

Package Microsoft.AspNetCore.Razor.Test.Common (10.4.0-preview.26310.106) net472
Preview This API is contained in a prerelease package.
Platform Restrictions

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  • Package-provided API