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Z-index Properties--Define the hierarchy of elements in the page

Source: Internet
Author: User
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Description: Sets the position of an anchored element along the z axis, defined as the axis that extends vertically to the display area. If positive, it is closer to the user and a negative number means farther away from the user.

Note: An element can have a negative Z-index property value. Z-index only works on positioning elements (e.g. position:absolute;)!

Available values:

Auto: Default. The stacking order is equal to the parent element.

Number: Sets the stacking order of the elements.

Inherit: Specifies that the value of the Z-index property should be inherited from the parent element.

Instance:

<HTML>    <Head>    <styletype= "Text/css">img.x{position:Absolute; Left:0px;Top:0px;Z-index:-1}    </style>    </Head>    <Body>        <H1>This is a headline</H1>        <imgclass= "X"src= "/i/eg_mouse.jpg" />         <P>The default z-index is 0. The z-index-1 has a lower priority.</P>    </Body></HTML>

Details: http://www.w3school.com.cn/cssref/pr_pos_z-index.asp

Z-index Properties--Define the hierarchy of elements in the page

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