difference between visibility:hidden and display:nonevisibility:hidden hides an element, but it
difference between "visibility:hidden" and "display:none"
visibility:hidden hides an element, but it will still take up the same space as before. The element will be hidden, but still affect the layout.
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display:none hides an element, and it will not take up any space. The element will be hidden, and the page will be displayed as the element is not there:
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http://www.w3schools.com/css/css_display_visibility.asp