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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="canonical" href="https://www.siegemedia.com/contrast-ratio" />
<link rel="stylesheet" href="style.css" />
<link rel="shortcut icon" type="image/png" href="about:blank" />
</head>
<script async src="https://www.googletagmanager.com/gtag/js?id=G-NL5QBPSX6M"></script>
<script>
window.dataLayer = window.dataLayer || [];
function gtag() { dataLayer.push(arguments); }
gtag('js', new Date());
gtag('config', 'G-NL5QBPSX6M');
</script>
<body>
<h1><a href="#">
<div><span>Contrast</span></div>
<div><strong>ratio</strong></div>
</a></h1>
<label class="background">
<span>Background:</span>
<div class="input-wrapper">
<input id="background" class="text-input" value="white" autofocus />
<input id="backgroundColorPicker" class="color-picker" type="color" tabindex="-1" />
</div>
<output for="background foreground" class="rl" aria-live="polite" aria-label="Relative Luminance"></output>
</label>
<label class="foreground">
<span>Text color:</span>
<div class="input-wrapper">
<input id="foreground" class="text-input" value="hsla(200,0%,0%,.7)" />
<input id="foregroundColorPicker" class="color-picker" type="color" tabindex="-1" />
</div>
<output for="background foreground" class="rl" aria-live="polite" aria-label="Relative Luminance"></output>
</label>
<output for="background foreground" class="contrast" tabindex="0" aria-live="polite">
<strong>?</strong>
<span class="error"></span>
</output>
<section id="results">
<output for="background foreground" id="preciseContrast" aria-label="Precise contrast"></output>
<output for="background foreground" id="wcag"></output>
</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, <span style="font-style: italic;">italic</span>,
<span style="font-weight: bold;">bold</span>, or <span style="font-style: italic; font-weight: bold;">bold
italic</span> 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 2.1 on contrast
ratio</a>
</footer>
</section>
<section class="color-display" id="foregroundDisplay">
<button id="swap">↔ Swap colors</button>
</section>
<div class="siege-media-cta">
<a href="https://www.siegemedia.com">
<img src="./sm-logo.svg" class="siege-media-logo" alt="Siege Media logo" />
</a>
<div>
<p>Contrast Ratio will soon be moving and improving! See us soon on Siege Media.</p>
<p class="siege-link"><b><a href="https://www.siegemedia.com">Learn About Siege Media</a></b></p>
</div>
</div>
<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/siege-media/contrast-ratio" data-icon="octicon-star"
data-size="large" data-show-count="true" aria-label="Star siege-media/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>
</body>
</html>