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How to use css z-index attribute

青灯夜游

May 27, 2019 pm 02:23 PM

cssz-index attribute

css The z-index attribute is used to set the stacking order of elements; elements with a higher stacking order will always be in front of elements with a lower stacking order. This attribute only works on positioned elements (for example: position:absolute, position:relative, or position:fixed).

How to use css z-index attribute

How to use the css z-index attribute?

z-index property sets the stacking order of elements. Elements with a higher stacking order will always appear in front of elements with a lower stacking order.

Syntax:

z-index : auto | number;

Parameters:

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

number: Numeric value, sets the stacking order of elements; it can be a positive value or a negative value.

Description: This property sets the position of a positioned element along the z-axis, which is defined as the axis extending vertically to the display area. If it is a positive number, it is closer to the user, and if it is a negative number, it is further away from the user.

Note: All major browsers support the z-index attribute. The attribute value "inherit" is not supported in any version of Internet Explorer (including IE8). Elements can have negative z-index attribute values. Z-index only works on positioned elements (for example: position:absolute, position:relative, or position:fixed)!

css z-index attribute example

<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<style type="text/css">
img {
position: absolute;
left: 0px;
top: 0px;
z-index: -1;
}
h2,p{
background-color: white;
border: 1px solid red;
}
</style>
</head>
<body>
<h2 id="This-nbsp-is-nbsp-a-nbsp-heading">This is a heading</h2>
<img  src="/static/imghwm/default1.png"  data-src="https://img.php.cn/upload/article/000/005/656/5af270fd37755429.jpg"  class="lazy"   / alt="How to use css z-index attribute" >
<p>由于图像的 z-index 是 -1，因此它在文本的后面出现。</p>
</body>
</html>

Rendering:

How to use css z-index attribute

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