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Role of CSS: valid Selector
The CSS :valid selector is used to style form input elements that contain valid values according to their specified type or validation constraints. This pseudo-class selector automatically applies styles when the input meets the validation criteria.
Syntax
input:valid {
/* styles for valid inputs */
}
Example: Email Validation Styling
The following example demonstrates how to style email inputs with valid email addresses −
<!DOCTYPE html>
<html>
<head>
<style>
input[type="email"] {
padding: 10px;
border: 2px solid #ccc;
border-radius: 4px;
font-size: 16px;
width: 300px;
}
input:valid {
background-color: #d4edda;
border-color: #28a745;
color: #155724;
}
input:invalid {
background-color: #f8d7da;
border-color: #dc3545;
color: #721c24;
}
</style>
</head>
<body>
<h2>Email Validation Example</h2>
<form>
<label for="email">Enter your email:</label><br>
<input type="email" id="email" name="email" value="user@example.com">
<p>Try typing different email addresses to see the validation styling.</p>
</form>
</body>
</html>
An email input field appears with a green background and border, indicating the email "user@example.com" is valid. When you type an invalid email format, the field turns red.
Example: Multiple Input Types
The :valid selector works with various input types that have built-in validation −
<!DOCTYPE html>
<html>
<head>
<style>
.form-group {
margin: 15px 0;
}
input {
padding: 8px;
border: 2px solid #ddd;
border-radius: 4px;
width: 200px;
}
input:valid {
border-color: #28a745;
box-shadow: 0 0 5px rgba(40, 167, 69, 0.3);
}
input:invalid {
border-color: #dc3545;
box-shadow: 0 0 5px rgba(220, 53, 69, 0.3);
}
</style>
</head>
<body>
<h2>Form Validation Styling</h2>
<form>
<div class="form-group">
<label>Email:</label><br>
<input type="email" value="test@domain.com" required>
</div>
<div class="form-group">
<label>URL:</label><br>
<input type="url" value="https://example.com" required>
</div>
<div class="form-group">
<label>Number (1-100):</label><br>
<input type="number" min="1" max="100" value="50" required>
</div>
</form>
</body>
</html>
Three input fields appear with green borders and subtle green shadows, indicating all values are valid. The email shows a valid email format, URL shows a valid web address, and number shows a value within the specified range.
Conclusion
The :valid selector provides an excellent way to give immediate visual feedback for valid form inputs. It works automatically with HTML5 input types and validation attributes, making forms more user-friendly and accessible.
Updated on: 2026-03-15T12:25:34+05:30
227 Views
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