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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="utf-8" />
<title>Contrast Ratio: Easily calculate color contrast ratios. Passing WCAG was never this easy!</title>
<link rel="stylesheet" href="style.css" />
<link rel="shortcut icon" type="image/png" href="about:blank" />
</head>
<body>
<h1><a href="#"><div><span>Contrast</span></div> <div><strong>ratio</strong></div></a></h1>
<label class="background">
<span>Background:</span>
<input id="background" value="white" autofocus />
</label>
<label class="foreground">
<span>Text color:</span>
<input id="foreground" value="hsla(200,0%,0%,.7)" />
</label>
<output tabindex="0" aria-live="polite">
<strong>?</strong>
<span class="error"></span>
</output>
<section id="results">
</section>
<section class="color-display" id="backgroundDisplay">
<h1>How to use</h1>
<p>As you type, the contrast ratio indicated will update. Hover over the circle to get more detailed information. When semi-transparent colors are involved as backgrounds, the contrast ratio will have an error margin, to account for the different colors they may be over.</p>
<p style="font-family: Garamond, 'Palatino Linotype', Georgia, serif;">This sample text attempts to visually demonstrate how readable this color combination is, for normal or <strong>bold</strong> text of various sizes and font styles.</p>
<p style="font-size: 11pt;"><strong>Hint:</strong> Press the up and down keyboard arrows while over a number inside a functional color notation. Watch it increment/decrement. Try with the Shift or Alt key too!</p>
<footer>
By <a href="http://lea.verou.me" rel="noopener" target="_blank">Lea Verou</a>
• <a href="https://www.w3.org/TR/WCAG/#contrast-minimum" rel="noopener" target="_blank">WCAG 2.0 on contrast ratio</a>
</footer>
</section>
<section class="color-display" id="foregroundDisplay">
<button id="swap">↔ Swap colors</button>
<script async src="https://cdn.carbonads.com/carbon.js?zoneid=1673&serve=C6AILKT&placement=contrastratiocom" id="_carbonads_js"></script>
</section>
<footer></footer>
<script src="https://leaverou.github.io/incrementable/incrementable.js" id="incrementable" async></script>
<script src="color.js"></script>
<script src="contrast-ratio.js"></script>
<div class="social">
<a class="github-button" href="https://github.com/leaverou/contrast-ratio" data-icon="octicon-star" data-size="large" data-show-count="true" aria-label="Star leaverou/contrast-ratio on GitHub">Star</a>
</div>
<!-- Place this tag in your head or just before your close body tag. -->
<script async defer src="https://buttons.github.io/buttons.js"></script>
<script>
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
(i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
ga('create', 'UA-117109922-1', 'auto');
ga('send', 'pageview');
</script>
</body>
</html>