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Tokenization and cleaning of markdown files

Many of the properties and values that we have encountered so far in our CSS learning have been tied to the physical dimensions of our screen. We create borders on the top, right, bottom, and left of a box, for example. These physical dimensions map very neatly to content that is viewed horizontally, and by default the web tends to support left-to-right languages (e.g., English or French) better than right-to-left languages (such as Arabic).