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doc: underline links

Rodrigo Muino Tomonari requested to merge github/fork/Trott/doc-underline-links into main

The current use of color only to differentiate links fails WCAG A accessibility standards.

Possible solutions are:

  1. Using a text indicator to show that the text is a link.
  2. Using additional cues (such as underlining).
  3. Providing color contrast of 3:1 or greater with surrounding text (not the background--the adjacent text!) along with visual cues on hover.

The solution here implements the second option.

Ref: https://www.w3.org/WAI/WCAG21/Understanding/use-of-color.html Ref: https://www.w3.org/WAI/WCAG21/Techniques/failures/F73 Ref: https://www.w3.org/WAI/WCAG21/Techniques/general/G182

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