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I expect form errors to be stylable. It probably needs the CSS Working Group to conjure up more pseudoelements/ classes and they’re unlikely to want to do that while the HTML5 spec is still moving.
I re-reiterate my advice r/e styling forms:
“itâ€™s best for usability to leave form fields as close to system defaults as possible. There is always a â€œdynamic tensionâ€ (= war) between branding managers and designers versus usability experts, but it helps no-one if your forms are beautiful but unusable or confusing.”