File: gradient-longer-hue-hsl-003-ref.html

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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: 20px;
  --to: 80px;
}

.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>