HTML Form Validation

<form action="/submit" method="post">
    <label for="name">Name:</label>
    <input type="text" id="name" name="name" required>
    <br><br>

    <label for="email">Email:</label>
    <input type="email" id="email" name="email" required>
    <br><br>

    <label for="age">Age (must be a number between 18 and 60):</label>
    <input type="number" id="age" name="age" min="18" max="60" required>
    <br><br>

    <label for="website">Website (URL must start with http:// or https://):</label>
    <input type="url" id="website" name="website" pattern="https?://.+" required>
    <br><br>

    <button type="submit">Submit</button>
</form>