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<!DOCTYPE html>
<html>
<head>
<title></title>
<style type="text/css">
div {
width: 300px;
height: 150px;
background: conic-gradient(
from 90deg at 100px 50px,
red 0.2turn,
orange 0.2turn 0.4turn,
yellow 0.4turn 0.6turn,
green 0.6turn 0.8turn,
blue 0.8turn 1.0turn
);
</style>
</head>
<body>
<div id="output"></div>
</body>
</html>