What is a z-index?
Z-index is a CSS property that sets the stack order of specific elements. An element with greater stack order is always in front of an element with a lower stack order.
Explain how you solved some css problem?
You should be able to explain a CSS bug that you worked on and how you went about solving it. You could talk about IE issues, take a look at these CSS problems that often need solutions for Internet Explorer.
Explain the benefits of CSS sprites?
Most importantly there is a performance benefit as CSS sprites reduce page load time by minimizing HTTP requests for different images. Usually there is also an accessibility benefit as the code degrades gracefully and shows text to screen readers, search engines, and browsers without CSS. I also think that CSS sprites are easier to manage as you are working with one image instead of many small images. Finally, you should also know how to implement CSS sprites.
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