The goal will be to morph the icon on a toggle button from its hamburger shape into an X shape. Some common Transitions are: There are dozens more. CSS3 animations. Let&39;s generically call this initial state asstateOne. The scroll position, not total screen height, is the determining factor for performance. Now "how" you cut to get there is a different story. Some user agents, like those based on Gecko, implement this requirement and others, like those based on WebKit, are less strict.
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