One variation of a method for serving interactive advertisement content includes, at a visual element rendered within a window of a computing device: loading an interactive advertisement, including a digital advertisement and a mask overlaid the digital advertisement, into the visual element, the mask including a base layer and an aperture defining a second opacity less than a first opacity of the base layer; in response to a scroll event that moves the visual element a first position within the window, rendering the interactive advertisement within the visual element; and, in response to a scroll event that moves the visual element to a second position within the window, transforming the mask according to a sequence of transformations at a rate proportional to a scroll rate of the scroll event, the sequence of transformations corresponding to a sequence of vertical positions of the visual element within the window.