Trying to simulate how a user stylesheet on a device will work in the editor is not so straightforward. It depends on how the user stylesheet is implemented in the device. For instance, some readeing software simply insert the stylesheet as an extra sheet in the document, at the start or at the eend. Some use the webkit user stylesheet facility, and so on. So just inserting a user sheet in the editormay or may not simulate what the sheet does on the device accurately.
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