All WCAG criteria
WCAG 2.1·Perceivable·1.4 Distinguishable
1.4.11 Non-text Contrast
Level AAUI components (form borders, button outlines, focus rings) and important graphics need 3:1 contrast.
Why it matters
A border that does not contrast with the background makes form fields invisible to low-vision users.
Common failure
<input style="border:1px solid #ddd">
Accessible version
<input style="border:1px solid #767676">
How OnlyEnable handles this
Partially mitigated. OnlyEnable addresses common patterns, but full conformance needs source-code work.