According to http://en.wikipedia.org/wiki/Quirks_mode, Standards Mode is set via:
"For example, a web page which began with the following DOCTYPE would trigger standards mode:"
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
Even with the above setting, GB2 doesn't render correctly. For now, I would recommend that we revert to what we had:
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
Since we don't see the UI issues with this setting.