To reproduce this issue:
- As a logged-on user go to your profile and click "Blog entries".
- If there's no blog entry yet, create a new one.
- Back on the Blog entries page, click the comments link to expand the comments and show the comment text area.
- Check that the comment text area shows a placeholder text "Add a comment..."
- Click again on the comments link to hide the comments and the text area.
- Click again on the comments link to expand the comments and the text area. Notice that the "Add a comment..." placeholder text is not being shown.