File: gradient-single-stop-none-interpolation.html

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<!DOCTYPE html>
<meta charset="utf-8">
<title>Gradient interpolation with single stop that has missing components</title>
<link rel="author" title="CGQAQ" href="mailto:m.jason.liu@gmail.com">
<link rel="help" href="https://www.w3.org/TR/css-color-4/#interpolation">
<meta name="assert" content="Gradients with single color stop that having missing components should resolve to zero.">
<link rel="match" href="gradient-single-stop-none-interpolation-ref.html">
<style>
  div {
    height: 100px;
  }

  #basic {
    /* "none" should resolve to zero when we only have one single stop. */
    background: linear-gradient(to right in srgb, color(srgb none 0.5 0.5));
  }

  #multipleNone {
    /* "none" and "none" gives zero. */
    background: linear-gradient(to right in srgb, color(srgb none 0 none));
  }

  #allNone {
    /* "none" and "none" gives zero. */
    background: linear-gradient(to right in srgb, color(srgb none none none));
  }

  #noneHue {
    background: linear-gradient(to right in oklch, oklch(0.8 0.4 none));
  }

  #noneHueLonger {
    background: linear-gradient(to right in oklch longer hue, oklch(0.5 0.3 none));
  }
</style>
<div id="basic"></div>
<div id="multipleNone"></div>
<div id="allNone"></div>
<div id="noneHue"></div>
<div id="noneHueLonger"></div>