BlazorFiddle - Blazor .Net Developer Playground and Code Editor in the Browser.

Index

@page "/"

<input type="submit" @onclick="SetText"/> @text

@if (display == true)
{   
    <text>
         <svg>
            <path id="circle" d="m96.06557,140.16394c-27.62431,0 -50,-22.37569 -50,-50c0,-27.62431 22.37569,-50 50,-50c27.62431,0 48.85246,22.37569 48.85246,50c0,27.62431 -21.22815,50 -48.85246,50z" />
            <text transform="rotate(155 95.4918 90.1639)">
                <textPath href="#circle">
                    @text
                </textPath>
            </text>
        </svg>

        <svg>
            <path id="circle" d="m96.06557,140.16394c-27.62431,0 -50,-22.37569 -50,-50c0,-27.62431 22.37569,-50 50,-50c27.62431,0 48.85246,22.37569 48.85246,50c0,27.62431 -21.22815,50 -48.85246,50z" />
            <text transform="rotate(155 95.4918 90.1639)">
                <textPath href="#circle">
                    EXPECTED RESULT
                </textPath>
            </text>
        </svg>
    </text>
}

@code {
    public string? text;
    private bool display = false;

    protected override async Task OnInitializedAsync()
    {
        text = await GetText();
    }
    
    public Task<string> GetText()
    {
        return Task.FromResult("Loading...");
    }

    public void SetText() {
        text = "LOADED";
        display = true;
    }
}

namespace BlazorFiddleProject
{
    using Microsoft.AspNetCore.Components.Builder;
    using Microsoft.Extensions.DependencyInjection;


    public class Startup
    {
        public void ConfigureServices(IServiceCollection services)
        {
        }

        public void Configure(IComponentsApplicationBuilder app)
        {
            app.AddComponent<App>("app");
        }
    }
}

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8"/>
    <meta name="viewport" content="width=device-width">
    <title>BlazorFiddleProject</title>
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
	
	<script src="_content/MatBlazor/dist/matBlazor.js"></script>

    <style>
        app { }
    </style>

    <script type="text/javascript">
    </script>
</head>
<body>
<app>Loading...</app>

<script src="_framework/blazor.webassembly.js"></script>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>
</html>

BlazorFiddle was updated from Blazor 0.7 to .NET 6.0. Your old source code could not work. You need to upgrade to latest.