Under certain circumstances, changing the background color of text in the EDP view is not saved.
This can be seen when changing the background color of a large block of text or a large list.
The user will select the text, change the background color. It will appear in the color chosen, however after saving and navigating away from the page, the next time the artifact is accessed, the background color has reverted.
At the time, development is focusing attention on resolving issues with the Quick Detail Pane (QDP) as well as bringing QDP up to feature parity with EDP. Since the highlighting function does work correctly in QDP, and the focus on improving QDP moving forward, development has made the decision to leave the behavior as is.