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relative-colors.html
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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8" />
<meta name="viewport" content="width=device-width, initial-scale=1.0" />
<title>Document</title>
</head>
<body>
<div class="sample associative">
<p>CSS <span class="friend">RELATIVE</span> COLORS</p>
<div class="swatches">
<p style="--g1: var(--ass1); --g2: var(--ass2)" class="sub">colors</p>
<span class="swatch" style="--swatch: var(--ass1)">Associative</span>
<span class="swatch" style="--swatch: var(--ass2)">colors</span>
<p style="--g1: var(--complimentary); --g2: var(--color)" class="sub">Complimentary color</p>
<span class="swatch" style="--swatch: var(--complimentary)">complimentary</span>
<p style="--g1: var(--triadic1); --g2: var(--triadic2)" class="sub">Triadic colors</p>
<span class="swatch" style="--swatch: var(--triadic1)">Triadic</span>
<span class="swatch" style="--swatch: var(--triadic2)">colors</span>
<p style="--g1: var(--tetradic1); --g2: var(--tetradic2)" class="sub">Tetradic colors</p>
<span class="swatch" style="--swatch: var(--tetradic1)">Tetr</span>
<span class="swatch" style="--swatch: var(--tetradic2)">adic</span>
<span class="swatch" style="--swatch: var(--tetradic3)">Colors</span>
<p class="sub">Lighter + Darker</p>
<span class="swatch dark" style="--swatch: var(--darker1)">×</span>
<span class="swatch dark" style="--swatch: var(--darker2)">×</span>
<span class="swatch dark" style="--swatch: var(--darker3)">×</span>
<span class="swatch dark" style="--swatch: var(--darker4)">×</span>
<span class="swatch dark" style="--swatch: var(--darker5)">×</span>
<span class="swatch dark" style="--swatch: var(--darker6)">×</span>
<span class="swatch dark" style="--swatch: var(--darker7)">×</span>
<span class="swatch dark" style="--swatch: var(--darker8)">×</span>
<span class="swatch dark" style="--swatch: var(--darker9)">×</span>
<span class="swatch dark" style="--swatch: var(--darker10)">×</span>
<span class="swatch dark" style="--swatch: var(--darker11)">×</span>
<span class="swatch dark" style="--swatch: var(--darker12)">×</span>
<span class="swatch dark" style="--swatch: var(--darker13)">×</span>
<span class="swatch dark" style="--swatch: var(--darker14)">×</span>
<span class="swatch dark" style="--swatch: var(--darker15)">×</span>
<span class="swatch dark" style="--swatch: var(--darker16)">×</span>
<span class="swatch dark" style="--swatch: var(--darker17)">×</span>
<span class="swatch dark" style="--swatch: var(--darker18)">×</span>
<br />
<span class="swatch dark" style="--swatch: var(--lighter1)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter2)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter3)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter4)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter5)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter6)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter7)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter8)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter9)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter10)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter11)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter12)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter13)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter14)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter15)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter16)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter17)">×</span>
<span class="swatch dark" style="--swatch: var(--lighter18)">×</span>
</div>
</div>
<style>
.demo {
--convert: rgb(from #bada55 r g b / 0.5);
background: var(--convert);
}
:root {
--color: #b1a2ee;
--darker: hsl(from var(--color) h s calc(l - 20%));
--lighter: hsl(from var(--color) h s calc(l + 40%));
--opaque: hsl(from var(--darker) h s l / 0.2);
--ass1: hsl(from var(--color) calc(h + 30deg) s l);
--ass2: hsl(from var(--color) calc(h - 60deg) s l);
--complimentary: hsl(from var(--color) calc(h + 180deg) s l);
--triadic1: hsl(from var(--color) calc(h + 120deg) s l);
--triadic2: hsl(from var(--color) calc(h - 120deg) s l);
--tetradic1: hsl(from var(--color) calc(h + 90deg) s l);
--tetradic2: hsl(from var(--color) calc(h - 90deg) s l);
--tetradic3: hsl(from var(--color) calc(h + 180deg) s l);
--darker1: hsl(from var(--color) h s calc(l * 0.1));
--darker2: hsl(from var(--color) h s calc(l * 0.15));
--darker3: hsl(from var(--color) h s calc(l * 0.2));
--darker4: hsl(from var(--color) h s calc(l * 0.25));
--darker5: hsl(from var(--color) h s calc(l * 0.3));
--darker6: hsl(from var(--color) h s calc(l * 0.35));
--darker7: hsl(from var(--color) h s calc(l * 0.4));
--darker8: hsl(from var(--color) h s calc(l * 0.45));
--darker9: hsl(from var(--color) h s calc(l * 0.5));
--darker10: hsl(from var(--color) h s calc(l * 0.55));
--darker11: hsl(from var(--color) h s calc(l * 0.6));
--darker12: hsl(from var(--color) h s calc(l * 0.65));
--darker13: hsl(from var(--color) h s calc(l * 0.7));
--darker14: hsl(from var(--color) h s calc(l * 0.75));
--darker15: hsl(from var(--color) h s calc(l * 0.8));
--darker16: hsl(from var(--color) h s calc(l * 0.85));
--darker17: hsl(from var(--color) h s calc(l * 0.9));
--darker18: hsl(from var(--color) h s calc(l * 0.95));
--lighter1: hsl(from var(--color) h s calc(l * 1.1));
--lighter2: hsl(from var(--color) h s calc(l * 1.15));
--lighter3: hsl(from var(--color) h s calc(l * 1.2));
--lighter4: hsl(from var(--color) h s calc(l * 1.25));
--lighter5: hsl(from var(--color) h s calc(l * 1.3));
--lighter6: hsl(from var(--color) h s calc(l * 1.35));
--lighter7: hsl(from var(--color) h s calc(l * 1.4));
--lighter8: hsl(from var(--color) h s calc(l * 1.45));
--lighter9: hsl(from var(--color) h s calc(l * 1.5));
--lighter10: hsl(from var(--color) h s calc(l * 1.55));
--lighter11: hsl(from var(--color) h s calc(l * 1.6));
--lighter12: hsl(from var(--color) h s calc(l * 1.65));
--lighter13: hsl(from var(--color) h s calc(l * 1.7));
--lighter14: hsl(from var(--color) h s calc(l * 1.75));
--lighter15: hsl(from var(--color) h s calc(l * 1.8));
--lighter16: hsl(from var(--color) h s calc(l * 1.85));
--lighter17: hsl(from var(--color) h s calc(l * 1.9));
--lighter18: hsl(from var(--color) h s calc(l * 1.95));
}
.sample {
--background: var(--color);
background: var(--background);
/* Not yet 100% working with this */
color: var(--lighter);
padding: 0px;
font-size: 50px;
font-family: system-ui, -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Oxygen, Ubuntu, Cantarell,
"Open Sans", "Helvetica Neue", sans-serif;
font-stretch: 150%;
text-transform: uppercase;
font-weight: 900;
text-align: center;
font-size: 0;
}
.swatch {
background: var(--swatch);
font-size: 20px;
padding: 10px;
display: inline-block;
color: color-contrast(var(--swatch) vs var(--lighter), var(--darker));
}
.swatch.dark {
font-size: 10px;
}
span.friend {
color: var(--darker);
}
p {
margin: 0;
text-align: center;
}
p.sub {
font-size: 20px;
margin: 10px;
padding: 5px;
background: linear-gradient(45deg, var(--g1), var(--g2));
border-top: 5px solid var(--darer);
}
body {
background: var(--color);
margin: 0;
}
</style>
</body>
</html>