Links on focus

Hello,

If the focused state of a link is only indicated by a colour difference relative to its original state does this fail 1.4.1 Use of colour? G183 seems to imply that it does but this also encompasses links being a different colour from surrounding text so I wasnt sure?

1.4.11 non-text contrast is a bit vague on this, again it mentions colour difference of links with surrounding text with respect to 1.4.1 but doesnt say much about links in focus and 1.4.1.

Is a change in relative luminance between focused and unfocused links enough of a visual cue that the colour difference is sometimes acceptable as a focus indication?

Or is a change in colour to indicate focused and unfocused links never acceptable? In which case it would fail use if colour and focus visible? Or does it just fail focus visible because the focus state doesnt count as the sort of information covered by use of colour?

Thanks,

Sarah

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