Skabelon:Color contrast ratio
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This template returns the color contrast ratio between the two colors provided. It accepts two parameters, which can be a standard RGB hex color code (#RRGGBB) or a standard HTML color or CSS "orange" (= #FFA500). Color names and hex letters are case-insensitive (i.e. they may be upper- or lower-case).
Usage
[rediger kildetekst]Examples with light background
[rediger kildetekst]| Text Color |
Background color |
Sample | Code | Contrast ratio |
WCAG 2.0 conf. |
|---|---|---|---|---|---|
| #000000 | #FFFFFF | Sample | {{Color contrast ratio|#000000|#FFFFFF}} | 21 | AAA |
| #000080 | #DDDDDD | Sample | {{Color contrast ratio|#000080|#DDDDDD}} | 11.787 | AAA |
| #7B0000 | #FF9900 | Sample | {{Color contrast ratio|#7B0000|#FF9900}} | 5.324 | AA |
| #004800 | #AAAAAA | Sample | {{Color contrast ratio|#004800|#AAAAAA}} | 4.691 | AA |
| red | white | Sample | {{Color contrast ratio|red|white}} | 3.998 | Nej |
| #FF0000 | #FF9999 | Sample | {{Color contrast ratio|#FF0000|#FF9999}} | 1.955 | Nej |
Examples with dark background
[rediger kildetekst]| Text Color |
Background color |
Sample | Code | Contrast ratio |
WCAG 2.0 conf. |
|---|---|---|---|---|---|
| #BADFEE | black | Sample | {{Color contrast ratio|#BaDFeE|BlAcK}} | 14.878 | AAA |
| red | black | Sample | {{Color contrast ratio|red|black}} | 5.252 | AA |
| #FFFF00 | #00FFFF | Sample | {{Color contrast ratio|#FFFF00|#00FFFF}} | 1.168 | Nej |
WCAG 2.0
[rediger kildetekst]As a guide to selecting foreground and background colors for text, the Web Content Accessibility Guidelines 2.0 (guideline 1.4) classifies contrast ratios for ordinary text as follows:
| Font size | Not Compliant | Level AA | Level AAA |
|---|---|---|---|
| Normal | < 4.5 | 4.5 to 7.0 | > 7.0 |
| Large (18 pt or 14 pt bold) | < 3.0 | 3.0 to 4.5 | > 4.5 |
Normal wiki-text is rendered by common browsers at roughly 9.5 to 10.5 pt (12.5 to 14 px), depending on skin. Text would need to be about 180% or 140% bold to qualify as "Large" for WCAG purposes.