text_area_tag(要素名 [, エリア配下のテキスト, オプション or HTML属性 or イベント属性])
text_area_tag 'post'
# <textarea id="post" name="post"></textarea>
text_area_tag 'bio', @user.bio
# <textarea id="bio" name="bio">This is my biography.</textarea>
text_area_tag 'body', nil, rows: 10, cols: 25
# <textarea cols="25" id="body" name="body" rows="10"></textarea>
text_area_tag 'body', nil, size: "25x10"
# <textarea name="body" id="body" cols="25" rows="10"></textarea>
text_area_tag 'description', "Description goes here.", disabled: true
# <textarea disabled="disabled" id="description" name="description">Description goes here.</textarea>
text_area_tag 'comment', nil, class: 'comment_input'
# <textarea class="comment_input" id="comment" name="comment"></textarea>