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This is Cereal > Layering

Layering

The Internet Explorer message and other elements of the page are positioned absolutely, and a certain amount of care was applied to the layer order in order to prevent overlapping.

The z-index attribute is a valuable CSS control for the stacking order of positioned elements within a page. Because absolutely positioned elements are removed from the regular document flow, the default method of controlling overlapping often isn’t good enough. Without a z-index value, positioned elements will stack from the bottom up; elements that appear first in the HTML will be placed on the bottom of the stack, and elements that come after will stack on top of them.


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