Note that the the condition can be comprised of almost any data source, but must end up being a yes/no expression. If it does not, it will be reported as an issue by the Issue Checker. If more than one condition is true for an element, all conditions will be applied. If two conditions or more have contradictory properties (i.e. the same property is modified in different ways in two conditions or more), the last one wins. Thus, you can control the order by clicking on 'move up' or 'move down'.