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Test Info:
<!DOCTYPE html>
<html>
<head>
<style>
input {
width: 15em;
}
input[type=number]::placeholder {
color: blue;
opacity: 1.0;
}
input[type=number]::-moz-placeholder {
font-style: italic;
opacity: 1.0;
}
</style>
</head>
<body>
<input type="number" placeholder="123">
</body>
</html>