html - WCAG: Firefox and Edge don't show outline on focussed input elements when styles are applied - Stack Overflow
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css - How to reset / remove chrome's input highlighting / focus border? - Stack Overflow
focus-visible | CSS-Tricks - CSS-Tricks
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CSS Input Border Animation on Focus - Codeconvey
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Indicating focus to improve accessibility - Mozilla Hacks - the Web developer blog
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css input focus border Archives - Css3 Transition
How to remove outline around text input boxes in chrome using CSS? - GeeksforGeeks
Having a Little Fun With Custom Focus Styles | CSS-Tricks - CSS-Tricks
CSS: Double-Border, how to - Stack Overflow
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Fancy and flexible CSS outlines to help web accessibility | Erwin Hofman
A guide to designing accessible, WCAG-compliant focus indicators – Sara Soueidan, inclusive design engineer
html - CSS outline is different for input and input:focus - Stack Overflow
