Login As removes styles

When creating a course, we have discovered that if we include styles in our HTML it looks fine to the people who are logged in.

However, if an admin does a "Log in As", styles tags are removed.

How to duplicate issue:

1. Set default editor to Plain Text
2. Create a label.
3. Give it the code "<style>#testspan { font-size: 30px; }</style><span id="testspan">Test</span>"
4. Save and view.  Confirm that large Test prints out.
5. Log in as another user in the course.
6. See that the word Test is now smaller.
7. View HTML and see that the styles have been removed.