edx/edx-platform — pull request #1606 by zubair-arbi (2013-11-07 12:39:03+00:00)
Title: Show error on invalid html in course handout edit

STUD-293

Create a temporary html div and append textarea html to it.
Read the html from temp div again and compare it to user added html. If they dont match show error.

@adampalay