Following a discussion with Pigsonthewing, I'll assemble a table of colours that are WCAG AAA compatible with normal black text at up to 14pt (equal to 18px).
In each row, the "base colour" is the hue.
The last column is the darkest shade of that hue which meets the full WCAG AAA standard for (i) Brightness Difference, (ii) Colour Difference, (iii) Contrast Ratio, as measured by Snook's Colour Contrast Check.
Any colour of that hue with RGB values greater than those given will automatically be AAA compliant as well.
Note: none of these, except 'yellow', are AAA compatible, if the black text is replaced with link text (in Vector skin #0645AD ( ).
| base colour name | base colour | base colour in hex | base colour hue | darkest AAA colour |
|---|---|---|---|---|
| red | #FF0000 | 0° | #FF7B7B
| |
| orange | #FF8000 | 30° | #FFA74F
| |
| yellow | #FFFF00 | 60° | #FAFA00
| |
| chartreuse | #80FF00 | 90° | #A8FF4F
| |
| green | #00FF00 | 120° | #7BFF7B
| |
| spring green | #00FF80 | 150° | #4FFFA8
| |
| cyan | #00FFFF | 180° | #00FAFA
| |
| dodger blue | #0080FF | 210° | #4FA8FF
| |
| blue | #0000FF | 240° | #8888FF
| |
| electric indigo | #8000FF | 270° | #BB76FF
| |
| magenta | #FF00FF | 300° | #FF28FF
| |
| deep pink | #FF0080 | 330° | #FF52A9
| |
| grey | #808080 | - | #A7A7A7
|
With acknowledgement to Color Name & Hue for the names of the colours.
To do:
- darkest AAA compliant colours against #0645AD and 0B0080 (for links)
- lightest AAA compliant colours against white text (no links)