Color & Contrast

Topic	Technique	WCAG AA Requirement
Use of color	Use of color: Any information conveyed by color MUST be accompanied by a programmatically-discernible text alternative.	Required WCAG 1.4.1
	Visible Alternative: Any information conveyed by color MUST be accompanied by a visible alternative (text, image, etc.) that does not depend on color for meaning.	Required WCAG 1.4.1
Color Contrast	Small Text Contrast: Small text (under 18 point regular font or 14 point bold font) MUST have a contrast ratio of at least 4.5 to 1 with the background. Note: The contrast rule also applies to images of text, even though images of text are discouraged.	Required WCAG 1.4.3
	Large Text Contrast: Large text (at or over 18 point or 14 point bold) MUST have a contrast ratio of at least 3 to 1 with the background. Note: The contrast rule also applies to images of text, even though images of text are discouraged.	Required WCAG 1.4.3
	UI Component Contrast: The contrast of UI control boundaries compared to adjacent areas MUST be sufficient to distinguish the UI control from the adjacent areas.	Required WCAG 1.4.11 (WCAG 2.1)
	Visual Focus Indicator Contrast: The contrast of all visual focus indicators against the background MUST be at least 3 to 1.	Required WCAG 1.4.11 (WCAG 2.1)
High Contrast Mode	Retain Visible Information: Web content SHOULD retain all essential visual information in Windows High Contrast Mode.	best practice
	Don't Override: The design SHOULD NOT override Windows High Contrast Mode.	best practice