In this book, you have seen that you can define visual appearance using JSON styles at several levels. The final part of the learning curve is to appreciate how styles can cascade from a high-level definition down through progressively finer specifications. Appreciating this will allow you to save time when creating theme files as you are, in effect, able to define many presentation attributes once – rather than have to define all the subtleties of every visual.
These “cascading styles” happen in two separate ways:
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