When user uses mouse middle button to click the HTLM dom element, chrome doesn't fire onclick event. Instead, it fires onauxclick event. In blazor, we normally bind onclick event like this:

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<a href="..." target="_blank" @onclick="Click">
    ...
</a>

@code
{
    public void Click()
    {
        ...
    }
}

But you can't do this for onauxclick event. It will throw the following exception in runtime:

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blazor.webassembly.js:1 crit: Microsoft.AspNetCore.Components.WebAssembly.Rendering.WebAssemblyRenderer[100]
      Unhandled exception rendering component: Failed to execute 'setAttribute' on 'Element': '@onauxclick' is not a valid attribute name.
      Error: Failed to execute 'setAttribute' on 'Element': '@onauxclick' is not a valid attribute name.
          at e.applyAttribute (https://localhost/_framework/blazor.webassembly.js:1:17247)
          at e.insertElement (https://localhost/_framework/blazor.webassembly.js:1:16358)
          at e.insertFrame (https://localhost/_framework/blazor.webassembly.js:1:15235)
          at e.applyEdits (https://localhost/_framework/blazor.webassembly.js:1:13621)
          at e.updateComponent (https://localhost/_framework/blazor.webassembly.js:1:12937)
          at Object.t.renderBatch (https://localhost/_framework/blazor.webassembly.js:1:4622)
          at Object.window.Blazor._internal.renderBatch (https://localhost/_framework/blazor.webassembly.js:1:34907)
          at _mono_wasm_invoke_js_unmarshalled (https://localhost/_framework/dotnet.5.0.0-preview.7.20364.11.js:1:165464)
          at wasm_invoke_iiiiii (https://localhost/_framework/dotnet.wasm:wasm-function[2795]:0x84169)
          at icall_trampoline_dispatch (https://localhost/_framework/dotnet.wasm:wasm-function[4931]:0xd58a2)

From the exception, we know that, in this version of blazor, onauxclick is not supported. So you need bind it like this:

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<a href="..." target="_blank" onauxclick="@((Action)(() => Click()))">
    ...
</a>

@code
{
    public void Click()
    {
        ...
    }
}

This way can also be used to bind other events which are not supported natively by blazor.