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In SharePoint, the IDs of many elements are connected with dots (.), for example:
c3badbeeab9f121f7e670be619336f41
Anyone familiar with CSS knows that the dot (.) is used to mark the class selector. If you use it directly:
# Ribbon.Documents.EditCheckout{ }
is impossible to work as a selector.
Then the question is, how to use the id of the above element as a css selector? The solution is to use "escape characters", similar to the following:
# Ribbon\.Documents\.EditCheckout{ }
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