Does w3c standards allow for same z-indexes

Question

Just a quick question and I can't find the answer. I heard somewhere that you can't (well you can but it won't conform to w3c standards) have the same z-indexes. Is this true? Can I have two <div> elements with the z-index of 3? Thanks.

Answer 1

This is incorrect. It is valid to have multiple elements with the same z-index. To quote W3C's CSS2 spec:

Boxes with the same stack level in a stacking context are stacked back-to-front according to document tree order.

Answer 2

You can have two with the same index. they will just be layered in the order they appear in the html.