"Move placeholder to top example 2 - good example"
Bootstrap 4.1.1 Snippet by thangytp

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<link href="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/css/bootstrap.min.css" rel="stylesheet" id="bootstrap-css">
<script src="//maxcdn.bootstrapcdn.com/bootstrap/4.1.1/js/bootstrap.min.js"></script>
<script src="//cdnjs.cloudflare.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<!------ Include the above in your HEAD tag ---------->
<h1>The floating label</h1>
<div class="user-input-wrp">
<br/>
<input type="text" class="inputText" required/>
<span class="floating-label">Your email address</span>
</div>
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.user-input-wrp {
position: relative;
width: 50%;
}
.user-input-wrp .inputText{
width: 100%;
outline: none;
border:none;
border-bottom: 1px solid #777;
}
.user-input-wrp .inputText:invalid {
box-shadow: none !important;
}
.user-input-wrp .inputText:focus{
border-color: blue;
border-width: medium medium 2px;
}
.user-input-wrp .floating-label {
position: absolute;
pointer-events: none;
top: 18px;
left: 10px;
transition: 0.2s ease all;
}
.user-input-wrp input:focus ~ .floating-label,
.user-input-wrp input:not(:focus):valid ~ .floating-label{
top: 0px;
left: 10px;
font-size: 13px;
opacity: 1;
}
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