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+![Logo](https://www.siegemedia.com/wp-content/themes/SiegeMedia2022/assets/imgs/logo.svg)
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+# Contrast Ratio
+
+[Official version](https://www.siegemedia.com/contrast-ratio)
+
+A tool to calculate the [WCAG (Web Content Accessibility Guidelines)](https://www.w3.org/TR/WCAG/#contrast-minimum) contrast ratio of text on a web page.
+
+WCAG define two levels of compliance that differ only in the contrast ratio:
+
+Level AA:
+- 4.5:1 for normal text
+- 3:1 for large text
+- 3:1 for graphics and user interface components (such as form input borders)
+Level AAA:
+- 7:1 for normal text
+- 4.5:1 for large text
+
+Large text is defined as 14 point (typically 18.66px, or 1.2rem when the root font is 16px) and bold or larger, or 18 point (typically 24px or 1.5rem) or larger.
+
+NOTE: this repo does not create the public website any longer. The code is used as the basis for the page at [Siege Media](https://www.siegemedia.com/contrast-ratio).
+## Acknowledgements
+
+ - [Lea Verou](http://lea.verou.me/) for initial concept and programming
+ - [Seth Falco](https://github.com/SethFalco)
+