Using scroll effects in Muse, you can create animated effects that involve two (or more) "layers of content" that move in the browser at different speeds. It is a web design technique that enables you to set the speed and direction of each element. You can create many changes that occur based on page scroll movement, including controlling the motion, opacity, playback of a Slideshow widget, and Adobe Edge Animate content.
You can apply a background fill scroll effect to any element that has a background image set for a fill. Examples of elements that can have background images are rectangles, image frames, and text frames. You can also enable scroll effects in the Browser Fill menu, if you set a background fill image to display in the browser window. The scroll effects work with background image fills, set to original size, scale to fit, scale to fill, or tiled.
Scroll effects applied to background fill elements cannot be applied to objects that use certain graphic effects, such as bevel and inner glow. When these types of effects are applied to the selected object, the options in the Scroll section of the Fill panel are disabled.