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<!DOCTYPE html>
<html>
<head>
<style>
div {
height: 100px;
}
#basic {
/* "none" should split into two and take each neighboring value. */
background: linear-gradient(to right in srgb, color(srgb 0.5 0 0), color(srgb 0.5 0.5 0.5) 50%, color(srgb 1 0.5 0.5) 50%, color(srgb 1 1 1));
}
#multipleNone {
/* "none" and "none" gives zero. */
background: linear-gradient(to right in srgb, color(srgb 0 0 0), color(srgb 0.0 0.5 0.5) 50%, color(srgb 1 0.5 0.5) 50%, color(srgb 1 1 1));
}
#allNone {
/* "none" and "none" gives zero. */
background: linear-gradient(to right in srgb, color(srgb 0 0 0), color(srgb 0 1 1));
}
#noneHue {
background: linear-gradient(to right in oklch, oklch(0.2 0.1 90), oklch(0.8 0.4 90) 50%, oklch(0.8 0.4 180) 50%, oklch(0.3 0.2 180));
}
#noneHueLonger {
background: linear-gradient(to right in oklch longer hue, oklch(0.2 0.1 90), oklch(0.5 0.3 90) 50%, oklch(0.5 0.3 180) 50%, oklch(0.8 0.4 180));
}
#transparentHueIsPowerless {
/* oklch(0.627966 0.257704 29.2346) = "red"
oklch(0.451981 0.31321 264.051) = "blue" */
background: linear-gradient(to right in oklch, oklch(0.627966 0.257704 29.2346), oklch(0 0 29.2346 / 0) 50%, oklch(0 0 264.051 / 0) 50%, oklch(0.451981 0.31321 264.051));
}
</style>
</head>
<body>
<div id="basic"></div>
<div id="multipleNone"></div>
<div id="allNone"></div>
<div id="noneHue"></div>
<div id="noneHueLonger"></div>
<div id="transparentHueIsPowerless"></div>
</body>
</html>