when exporting an animated GIF with a simple fade transition between two layers, it appears to work within Photoshop but when previewing in the save for web window and in a browser,
the fade transitions don't appear.
When a GIF supports transparency it only supports 255 colors the 256 color is reserved for transparent. Which does not support a partly transparent a pixel is either 100% opaque or empty. A fade or something something like a drop would be made by dithering. Scaling that kind of gif can help how it looks on screen. The large one is not scaled the other two are the same gif file scaled. Animater pgn would be better but all browser do not support the use abs some like Chrome may have a plugin that support them. Latr image is an animated png...