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<label for="name">Product name:</label>
<input
id="name"
name="name"
type="text"
value="Shampoo"
minlength="3"
maxlength="20"
required />
<label for="description">Product description:</label>
<textarea
id="description"
name="description"
minlength="10"
maxlength="40"
required></textarea>
label {
display: block;
margin-top: 1em;
}
input:valid,
textarea:valid {
background-color: palegreen;
}
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<input type="password" maxlength="4" />
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