1. A method of coding transform coefficients associated with residual video data in a video coding process, the method comprising: defining a context derivation neighborhood for one of a plurality of transform coefficients using a sliding window that is determined based on a transform coefficient scan order and that includes a set of transform coefficients scanned prior to the one of the plurality of transform coefficients in the transform coefficient scan order, wherein the context derivation neighborhood indicates one or more transform coefficients of the plurality of transform coefficients from which a context is derived; determining the context for the one of the plurality of transform coefficients based on the context derivation neighborhood; and coding the one of the plurality of transform coefficients based on the determined context.