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<!DOCTYPE html>
<html lang="en">
<meta charset="utf-8">
<title>Gradient using "longer hue"</title>
<link rel="author" title="Jonathan Kew" href="mailto:jkew@mozilla.com">
<style>
div {
margin: 20px 0px 20px 50px;
height: 40px;
width: 100px;
position: relative;
background: linear-gradient(to right in hsl,
red var(--from),
color-mix(in hsl longer hue, red, blue),
blue var(--to));
}
.swatch {
--from: 50px;
--to: 100px;
}
.swatch::before {
content: '\feff';
position: absolute;
bottom: 40px;
height: 10px;
left: calc(var(--from) - 0.5px);
border: 0.5px solid red;
}
.swatch::after {
content: '\feff';
position: absolute;
top: 40px;
height: 10px;
left: calc(var(--to) - 0.5px);
border: 0.5px solid blue;
}
</style>
<div class="swatch"></div>