How to block DivSelect _ form special effects

However, div can cover iframe, while iframe can cover select. Therefore, an iframe is used as the base of div,

Solution to Div drop-down menu blocked by Select

Onmouseover = "this. style. height = 100;" onmouseout = "this. style. height = 18;">

Drop-down menu

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Div is blocked by Select, which is a common problem.
Some friends put p content into iframe or object to solve the problem.
It is a pity that this will damage the structure of the page, and the interaction is not good.
The method used here is:
Although p cannot directly cover select
However, p can cover iframe, while iframe can cover select,
Therefore, consider an iframe as the bottom of p,
This p can cover the select statement.