No "hover text" displayed on images in Drag and Drop activity
When editing a Drag and Drop activity, draggable elements can be either Texts or Images. When adding Images (thumbnails), these 2 fields are available:
Alternative textRequired. If the browser can't load the image this text will be displayed instead. Also used by readspeakers. Hover textOptional. This text is displayed when the user hovers his pointing device over the image.