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<!DOCTYPE html>
<html>
<head>
<style>
textarea {
mask: conic-gradient(at 94% 100%, blue 0% 100%) 66em 75% repeat repeat padding-box luminance;
border-right-style: inset;
background-clip: text;
}
</style>
</head>
<body>
<textarea cols="9999"></textarea>
</body>
</html>