In CSS, top means "top" and "distance from the top". The top attribute is used together with the position attribute to set the distance from the top of the positioned element. The top attribute can define the offset between the top margin boundary of a positioned element and the upper boundary of its containing block. The top attribute only works on positioned elements.
The operating environment of this tutorial: Windows 10 system, CSS3&&HTML5 version, Dell G3 computer.
What does top mean in css
In css, top means "top", and the top attribute is used to set positioning elements The distance from the top.
The top attribute specifies the top edge of the element. This property defines the offset between the top margin boundary of a positioned element and the top boundary of its containing block.
Note: If the value of the "position" attribute is "static", then setting the "top" attribute will have no effect.
The syntax is as follows:
position：absolute； //这个是必须的，top和left才能起作用 top: 10px; //距离顶部10像素，就是想下面移动10像素
The example is as follows:
<html>
<head>
<style type="text/css">
img{
position:absolute;
top:30px;
}
</style>
</head>
<body>
<img src="1115.08.png" / alt="What does top mean in css" >
<h1>This is a heading</h1>
</body>
</html>Output result:
(Learning video Share: css video tutorial)
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