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<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Gradient in HSL space - reference</title>
<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<style>
body {
background: #fff;
}
div {
width: 200px;
height: 50px;
margin: 10px;
background-image: linear-gradient(to right in hsl longer hue, red 0%, red var(--pos) var(--pos), red 100%);
}
</style>
</head>
<body>
<div style="--pos: 0%"></div>
<div style="--pos: 25%"></div>
<div style="--pos: 50%"></div>
<div style="--pos: 75%"></div>
<div style="--pos: 100%"></div>
</body>
</html>