Mal:Color contrast ratio

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Module:Color contrast

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

Examples with light background

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	Nei
#FF0000	#FF9999	Sample	`{{Color contrast ratio\|#FF0000\|#FF9999}}`	1.955	Nei

Examples with dark background

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	Nei

WCAG 2.0

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:

WCAG 2.0 text contrast ratios
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.

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