What is this string inside Blazor components HTML tag

I'm new to Blazor and trying to figure out how Blazor renders components into HTML tags. If I use a simple component like this:

<InputText @bind-Value="testvalue" id="sample-textbox"></InputText>@code {    public string testvalue = "abc123";}

Then I run my app, open dev tools, the resulting HTML is this:

<input id="sample-textbox" _bl_e4f3714a-7294-49f4-9c79-90762626ed41="">

What is the purpose of _bl_e4f3714a-7294-49f4-9c79-90762626ed41 ?