Rainbow Text-shadow

Textschatten verwenden um einen sich bewegenden Regenbogen zu erzeugen. Einmal mit canvas und einmal mit Css
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Der hier verwendete Code

<!DOCTYPE html>
<html lang="en">
<head>
<title>Rainbow Text-shadow - Matthew Lein</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no">
<style>
#example {
background-color:#000;
padding: 5px;
margin-bottom: 20px;
}
#example #holder {
display: block;
font-size: 250px;
font-family: sans-serif;
text-align: center;
color:#fff;
letter-spacing: 50px;
margin-top: 90px;
margin-bottom: 0px;
}
.beginTest {
margin-bottom: 10px;
}
canvas {
border: 1px solid black;
background-color: #000;
display: block;
margin-bottom: 20px;
}
</style>
</head>
<body>
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