book.html : Nested div.field

[jbuiquan]

Hi,

Is it a typo to nest the first form field (title) in another div with class field ?

<div class="field">
    <div class="field">
        <label class="label">Title</label>
        <div class="control">
            <input class="input is-large" type="text" value="TensorFlow For Machine Intelligence"
                placeholder="e.g. Designing with Bulma" required>
        </div>
    </div>
</div>