In CSS, border uses the gradient of border, so why can't you use radius fillet?

Why can"t you use the gradient of border when border uses radius fillet in CSS

Mar.19,2021


    Some text is here.<br/>
    There's even a line break!<br/>
    so cool.

Sorry, the examination is not rigorous, so it seems that it can only be achieved by adding background to pseudo elements

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