Markup: templates/output/04-elements/forms/textarea.html
<form class="powermail_form" action="#" method="post">
<div class="powermail_fields">
<div class="powermail_fieldwrap powermail_fieldwrap_type_textarea">
<label class="powermail_label" for="demoformid-textarea">Your message
</label>
<div class="powermail_field">
<textarea class="" id="demoformid-textarea" rows="8" cols="48" name="" placeholder="Enter your message here"></textarea>
</div>
</div>
<div class="powermail_fieldwrap powermail_fieldwrap_type_textarea">
<label class="powermail_label" for="demoformid-textarea-error">Your message
</label>
<div class="powermail_field">
<textarea class=" powermail_field_error" id="demoformid-textarea-error" rows="8" cols="48" name="" placeholder="Enter your message here"></textarea>
<ul class="powermail-errors-list filled" aria-live="polite">
<li>This field is required</li>
</ul>
</div>
</div>
</div>
</form>
Source:
assets/sass/04-elements/_elements.forms.scss, line 374