StarterCorev4.css is an intiative to help people looking out for css class explanations which is created in the Corev4.css. Once you have uploaded the StarterCorev4.css and added the required references into the master page, you will be able to click on the class files on the master page. This will lead you to the class file defined in StarterCorev4.css, which has a detailed explanation on the purpose of the class file.

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