BETEPAH,
<!DOCTYPE HTML>
<html>
<head>
<style type="text/css">
input + span {
color: #AAA;
display: none;
font-style: italic;
line-height: 20px;
margin-left: -165px;
position: absolute;
}
input:not(:focus):invalid + span {
display: inline;
}
</style>
</head>
<body>
<input required="required" type="text">
<span>Placeholder</span>
</body>
</html>