Example

$form = new Form('plugins-floating-labels-form-1', 'vertical');

$form->addInput('text', 'floating-labels-input-1', '', '', 'placeholder=Enter your name, required');
$form->addInput('text', 'floating-labels-input-2', 'default value', '', 'placeholder=Enter something, required');
$form->addTextarea('name', '', '', 'placeholder=Your message, required');
$form->addBtn('reset', 'floating-labels-reset-btn,', 1, 'Reset', 'class=btn btn-warning');

<div class="row">
    <div class="offset-sm-4 col-sm-8 mb-3">
        <input id="floating-labels-input-1" name="floating-labels-input-1" type="text" value="" placeholder="Enter your name" required class="form-control" aria-label="Enter your name">
    </div>
</div>
<div class="row">
    <div class="offset-sm-4 col-sm-8 mb-3">
        <input id="floating-labels-input-2" name="floating-labels-input-2" type="text" value="default value" placeholder="Enter something" required class="form-control" aria-label="Enter something">
    </div>
</div>
<div class="row">
    <div class="offset-sm-4 col-sm-8 mb-3">
        <textarea id="name" name="name" placeholder="Your message" required class="form-control" aria-label="Your message"></textarea>
    </div>
</div>
<div class="row">
    <div class="offset-sm-4 col-sm-8 mb-3">
        <button type="reset" name="floating-labels-reset-btn," value="1" class="btn btn-warning">Reset</button>
    </div>
</div>