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What was the intention of the rounded corners (half circle) – indicating to be connected to the specific form field?
If so, it doesn't make sense to leave it in, I'd rather remove them.
Also wondering about the primary button description “Submit“. Wouldn't “Create” or “Create list” be more specific?
hmm, @Volker_E. I tried to use it in the js, but it wasn't possible (let's say not easy). Because OOUI fields are made using php in this special page and the errorbox is being added using js and js can create a widget with error but can't take a OOUI field and append error easily (or I'm missing something, please correct me if I am).