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The default z-index value of all the elements on a web page is auto, which corresponds to 0 where no z-index is assigned. An element with z-index: -1 will be displayed behind all other elements on the page, assuming they are given no z-index values.
Z Index ( z-index ) is a CSS property that defines the order of overlapping HTML elements. Elements with a higher index will be placed on top of elements with a lower index. Note: Z index only works on positioned elements ( position:absolute , position:relative , or position:fixed ).
z-index only works on positioned elements (relative, absolute, fixed, sticky) so if you set a z-index on an element with a static position, it won't work.
The z-index property can be specified with an integer value (positive, zero, or negative), which represents the position of the element along the z-axis. If you are not familiar with the z-axis, imagine the page as a stack of layers, each one having a number.
I have a case where a 3rd party ad is bleeding through my modal window implementation. I'd like to up the z-index of the modal overlay as high as possible so the ad won't show on top of it. Is there a limit to z-index values? I'm sure if there is it varies by browser. Anyone know?
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