Introduction to position usage in html
This time I will bring you an introduction to the usage of position in html, and what are the precautions for using position in html. The following is a practical case, let’s take a look.
I just learned some content about HTML yesterday, and I couldn’t wait to make a search bar on JD.com. I finally made it, but when I was doing the shopping cart checkout, there was a number displayed on it. I don’t know how to add it. If you want the numbers to move with the shopping cart, you must position them together. Positioning definitely requires position. First, set the position of the div of the numbers to absolute. There is a layer. It seems that because the parent tag of the position of the number at this time is the body, when setting top and left, you can also set it to the desired position of the shopping cart. However, if you change the margin of the shopping cart, the two cannot move together, so Set the position of the shopping cart to relative, so that the parent tag of the position of the number becomes the shopping cart. No matter how the margin of the shopping cart is adjusted, the numbers will move with it...
<html>
<head>
<title>day03.html</title>
<style type="text/css">
/*首先写一个position的div*/
#car{
width:150px;height:30px;
background: #999999;
color:white;text-align: center;
line-height: 30px;margin: 232px 300px;
border:1px solid black;position: relative;
}
#num{
width:20px;height:20px;background: red;
color:white;text-aligh:center;
line-height:20px;position: absolute;
top:-15px;left:25px;
}
</style>
</head>
<body>
<div id="car">
去购物车付款
<div id="num">0</div>
</div>
</body>
</html>I believe you have mastered the methods after reading these cases. For more exciting information, please pay attention to other related articles on the php Chinese website!
Related reading:
How to use button trigger to achieve background color flashing
Defining multiple class attributes in HTML is invalid
The above is the detailed content of Introduction to position usage in html. For more information, please follow other related articles on the PHP Chinese website!
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