I have a problem with juxtaposition. I use the Lumi authoring tool to create H5P content. The problem arises when the content is exported as an HTML file. The first example shows a vertical slider. A piece of the background image remains white at the top and bottom. To me it looks like a shift of the front and back image.
The second example shows a horizontal image slider. This does not create a white area as in the previous example. However, a piece of the foreground and background image is missing in this case. This also looks like a shift between both images to me.