How to add HTML <textarea> dirname Attribute

It is An HTML form where the field's text direction will be submitted.

index.html

Example: HTML

 <form action="/action_page.php">
  Text:
  <textarea name="explanation" dirname="explanation.dir"></textarea>
  <input type="submit" value="Submit">
</form>

Output should be:

Type:	html
Category:	Web Tutorial
Sub Category:	HTML Tag
Uploaded by:	Admin