{{ govuk.formGroup(
    isTextarea = "true",
    value = "Content of text area",
    id = "full-name",
    name = "full-name",
    label = "Full name"
) }}
<%= govuk.form_group(
    isTextarea: "true",
    value: "Content of text area",
    id: "full-name",
    name: "full-name",
    label: "Full name"
) %> 
<div class="gv-c-form-group ">
    <label class="gv-c-form-group__label" for="full-name">
    Full name
    
    
  </label>

    <textarea class="gv-c-form-group__control " id="full-name" name="full-name" cols="30" rows="5">Content of text area</textarea>

</div>
{
  "isTextarea": "true",
  "value": "Content of text area",
  "id": "full-name",
  "name": "full-name",
  "label": "Full name"
}