CSS z-index overridden by element order on page?

StackOverflow https://stackoverflow.com/questions/1667154

  •  13-09-2019
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Question

I've been battling with CSS z-index in IE7 foe a couple of hours now, maybe you can help!

I have a absolutely positioned div, appearing above its parent div, which is great. But - it appears under later divs that are siblings to its parent.

That seems like quite bizarre behavour, like the z-index only applies to the local scope of each div or something.

How can I set things up so that when I set an element to have a greater z-index than any other element on the page, it will appear on top regardless?

Here's my test page:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html>
<head>
<title>test</title>
</head>
<body>
<div style="position: relative; z-index: 0">
    div1
    <div style="position: relative; z-index: 0">
        div2
    </div>
    <div style="color: red; background-color: #ffffff; position: absolute; z-index: 2">
        div3
    </div>
</div>
<div style="position: relative; z-index: 0">
    div1
    <div style="position: relative; z-index: 0">
        div2
    </div>
    <div style="color: red; background-color: #ffffff; position: absolute; z-index: 2">
        div3
    </div>
</div>
<div style="position: relative; z-index: 0">
    div1
    <div style="position: relative; z-index: 0">
        div2
    </div>
    <div style="color: red; background-color: #ffffff; position: absolute; z-index: 2">
        div3
    </div>
</div>
</body>
</html>
Was it helpful?

Solution

IE has a major z-index bug:

In Internet Explorer positioned elements generate a new stacking context, starting with a z-index value of 0. Therefore z-index doesn't work correctly.

You could try to change z-indexes, but if you want both elements to appear, you might have to pull them out of their ancestor structure and make them top-level DOM elements.

OTHER TIPS

An element with position:absolute will take the absolute position inside its container, especially if this container is set to position:relative.

All position:absolute elements that need to be positioned according to the viewport should come in the DOM directly under the "body" element. It is usually considered good practice to put them last in your html code, just before the closing body tag.

Just remove position: relative

Can an image have a style='z-index: #' or must the image reside in a div of it's own?

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