Ignore the target property
As a design choice, for example, a designer can add a boxshadow & radius to the frame of a website design frame. In this case, human developers can easily know that the boxshadow and the raius is a non relavent value and must be ignored. the --ignore=<property>
flag can be used useful for this case.
e.g.
--ignore=*
- same as//@ignore
--ignore=effects
--ignore=border-radius