First, let me thank you for adding the Width in the latest update (2.21). Much appreciated! 

https://www.w3schools.com/tags/tag_textarea.asp

We need a fixed height for our text areas to encourage user-interaction and ease the UX for the end user. Having (now a wide), but very narrow description field is not ideal and since it's basically a feature of HTML5, I don't see why it be exempt from Blazor UI.

<TelerikTextArea Rows="10" Width="100%" />

I would like to remove the resize handle and not let users change the size of the textarea.

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ADMIN EDIT

A solution in the meantime can be done with CSS:

<style>
    .no-resize.k-textarea > .k-input {
        resize: none;
    }
</style>

<TelerikTextArea @bind-Value="@taVal" Class="no-resize"></TelerikTextArea>

@code{
    string taVal { get; set; } = "lorem\nipsum";
}

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There should be a counter displayed like this

"n:m" With n = currentNumberOfCharacters and m = allowedNumberOfCharacters.