Why does z-index fail?

We know that sometimes in the process of writing code, we will find that thez-indexI wrote is invalid, so this time I will bring you why z-index will fail and why z-index is used.NotesWhat are the following? Let’s take a look at the actual cases.

1. The parent tagpositionattributeis relative;

2. The question tag has no position attribute (excludingstatic);

3. The question label containsfloat(float) attribute.

4. The z-index value of the ancestor tag of the question tag is relatively small.

If this is the case, only absolute and fixed positions are left.

I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!

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