Mouse-over properties (Web Animations)
Mouse-over properties are part of the Web Animations dialog. When you click this icon the Mouse-over tab of the Web Animations dialog opens allowing you to specify what should happen when a visitor moves the mouse pointer over the selected object. So for example you can animate the mouse-over with a wide range of effects, pop-up some text or a whole layer of content when a visitor hovers their mouse pointer over a photo or other object on your web page.
See Web Animations for more details.
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