Template:Greater color contrast ratio
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This template determines the pair of colors with the larger contrast ratio: color1/color2 or color1/color3. This is useful for selecting a foreground/background color pair. For accessibility, WCAG 2.0 AA guidelines require a contrast ratio of 3 or larger for large text, and 4.5 or larger for normal sized text. When used in the default mode, with color2 and color3 equal to white and black, the selected color pair will always have a contrast ratio greater than 4.58.
Examples
<span style="background:navy; color:{{Greater color contrast ratio|navy|white|black}}">Navy</span>
→ Navy<span style="{{Greater color contrast ratio|navy|white|black|css=y}}">Navy</span>
→ Navy<span style="{{Greater color contrast ratio|navy|css=y}}">Navy</span>
→ Navy<span style="background:red; color:{{Greater color contrast ratio|red|white|black}}">Red</span>
→ Red<span style="{{Greater color contrast ratio|red|white|black|css=y}}">Red</span>
→ Red<span style="{{Greater color contrast ratio|red|css=y}}">Red</span>
→ Red<span style="background:white; color:{{Greater color contrast ratio|white|white|black}}">White</span>
→ White<span style="{{Greater color contrast ratio|white|white|black|css=y}}">White</span>
→ White<span style="background:black; color:{{Greater color contrast ratio|black|white|black}}">Black</span>
→ Black<span style="{{Greater color contrast ratio|black|white|black|css=y}}">Black</span>
→ Black<span style="background:#005500; color:{{Greater color contrast ratio|#005500|#FFFFFF|#000000}}">#005500</span>
→ #005500<span style="{{Greater color contrast ratio|#005500|#FFFFFF|#000000|css=y}}">#005500</span>
→ #005500<span style="background:#005500; color:#{{Greater color contrast ratio|005500|FFFFFF|000000}}">005500</span>
→ 005500<span style="{{Greater color contrast ratio|005500|FFFFFF|000000}}">005500</span>
→ 005500<span style="background:#CC5500; color:#{{Greater color contrast ratio|CC5500|FFFFFF|000000}}">CC5500</span>
→ CC5500<span style="{{Greater color contrast ratio|CC5500|FFFFFF|000000|css=y}}">CC5500</span>
→ CC5500<span style="background:#CC5500; color:#{{Greater color contrast ratio|CC5500|FFFFFF|000000|bias=1}}">CC5500</span>
→ CC5500<span style="{{Greater color contrast ratio|CC5500|FFFFFF|000000|bias=1|css=y}}">CC5500</span>
→ CC5500<span style="background:Not a color; color:#{{Greater color contrast ratio|Not a color|FFFFFF|000000}}">Not a color</span>
→ Not a color<span style="{{Greater color contrast ratio|Not a color|FFFFFF|000000|css=y}}">Not a color</span>
→ Not a color
Optional parameters
The bias
parameter should be used with caution to ensure accessibility. As stated above, when used without a bias, and with color2 and color3 equal to white and black, the selected color pair will always have a contrast ratio greater than 4.58. A bias of 1.25, reduces the possible minimum to 4.0, which may not meet accessibility standards.
See also
- {{Ensure AAA contrast ratio}}
- {{Ensure AA contrast ratio}}
- Script error: No such module "Section link".
- Script error: No such module "Section link".
The above documentation is transcluded from Template:Greater color contrast ratio/doc. (edit | history) Editors can experiment in this template's sandbox (edit | diff) and testcases (create) pages. Please add categories to the /doc subpage. Subpages of this template. |