That's not to say, by the way, that the rendering principles and rules involved are in any way questionable - their existence is a highly creditable achievement. It's just the way they are then presented to the user as preferences that needs 'tightening up', so that full use can be made of the features.
"moderate" is a level which should be a default if we didn't have to support very old browsers. Unless you *know* that your browser is very old, it should work well with "moderate" level.
"liberal" mode, on the other hand, will often look ugly, no matter what browser you use.
Right, so that's what we need to communicate to users on the Preferences screen, right?