<html lang="en-US">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width">
<title>:valid and :invalid example</title>
<link href="https://fonts.googleapis.com/css?family=Josefin+Sans&display=swap" rel="stylesheet">
</head>
<body>
<form>
<fieldset>
<legend>Feedback form</legend>
<p>Required fields are labelled with "required".</p>
<div>
<label for="fname">First name: </label>
<input id="fname" name="fname" type="text" required>
<span></span>
</div>
<div>
<label for="lname">Last name: </label>
<input id="lname" name="lname" type="text" required>
<span></span>
</div>
<div>
<label for="email">Email address (include if you want a response): </label>
<input id="email" name="email" type="email">
<span></span>
</div>
<div><button>Submit</button></div>
</fieldset>
</form>
</body>
</html>
body {
font-family: 'Josefin Sans', sans-serif;
margin: 20px auto;
max-width: 460px;
}
fieldset {
padding: 10px 30px 0;
}
legend {
color: white;
background: black;
padding: 5px 10px;
}
fieldset > div {
margin-bottom: 20px;
display: flex;
flex-flow: row wrap;
}
button, label, input {
display: block;
font-family: inherit;
font-size: 100%;
padding: 0;
margin: 0;
box-sizing: border-box;
width: 100%;
padding: 5px;
height: 30px;
}
input {
box-shadow: inset 1px 1px 3px #ccc;
border-radius: 5px;
}
input:hover, input:focus {
background-color: #eee;
}
input + span {
position: relative;
}
input:required + span::after {
font-size: 0.7rem;
position: absolute;
content: "required";
color: white;
background-color: black;
padding: 5px 10px;
top: -26px;
left: -70px;
}
input + span::before {
position: absolute;
right: -20px;
top: 5px;
}
input:invalid {
border: 2px solid red;
}
input:invalid + span::before {
content: '✖';
color: red;
}
input:valid + span::before {
content: '✓';
color: green;
}
button {
width: 60%;
margin: 0 auto;
}
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