I agree — it seems much easier to follow focus when the style always looks the same. That makes a lot of sense but I don't think I'd ever had that thought. Thanks for pointing it out!
This is interesting though because while that outline looks bold and obvious to me, it actually doesn't have a high enough color contrast ratio in some cases (like when it's against a white background).
There's an issue in GitHub about it, but it was closed recently and I'm not sure why:
I think it might be because there is also an issue about meeting WCAG 2.1 standards: github.com/alphagov/govuk-design-s...
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