css clear float 3

CSS clearing floats is a common technique in Web front-end development, and clearing floats 3 is one of the most commonly used methods. In this article, we will focus on explaining the principles and application scenarios of CSS clear float 3, hoping to help readers.

1. CSS clears the concept of floating

In Web front-end development, floating is a very important element layout method, which allows elements to change with the size of the page like water flow. Variety. But at the same time, floating also brings some problems, such as element height collapse, element overlapping, and parent element height being inaccurate, etc. To solve these problems, we need to clear the float using CSS.

CSS clearing floats refers to using CSS properties or adding no-content tags to clear the impact of floating elements. Among them, CSS clear float 3 is one of the most commonly used methods.

2. The principle of CSS clearing float 3

The principle of CSS clearing float 3 is to clear the float by adding a pseudo element to the parent element and adding CSS attributes to the pseudo element. The specific implementation is as follows:

.clearfix::after {
content: "";
display: block;
clear: both;
height: 0;
visibility : hidden;
}

In the above code, .clearfix is ​​the class name we added to the parent element, ::after is the selector of the pseudo element, clear: both is the main attribute implementation of clearing floats, The other two attributes are to ensure that the pseudo element does not affect the display and layout of other elements.

3. Application scenarios of CSS Clear Float 3

CSS Clear Float 3 is suitable for situations where multiple floating elements are in the same parent element. In this case, if you do not use the clear float technique, it may cause problems such as inaccurate height of the parent element and overlapping elements. The following is a specific example:

<div class="parent">
  <div class="float-left">左浮动元素</div>
  <div class="float-right">右浮动元素</div>
</div>

In the above code, we use the float attribute to float the two child elements to the left and right sides respectively. However, due to failure to clear floats, the height of the .parent element may be inaccurate or even collapse. At this time, we can add the .clearfix class to clear the floats. The code is as follows:

<div class="parent clearfix">
  <div class="float-left">左浮动元素</div>
  <div class="float-right">右浮动元素</div>
</div>

In the above code, we only need to add the .clearfix class to the .parent element. There is no need to add other CSS attributes or Label.

4. Advantages and Disadvantages of CSS Clear Float 3

Compared with other methods of clearing float, CSS Clear Float 3 has the following advantages:

1. Easy to implement: You only need to add a class name to clear the float without introducing other CSS properties or tags.
2. Good compatibility: The implementation of CSS Clear Float 3 has good compatibility and is suitable for a variety of browsers and devices.
3. Easy to maintain: Use the .clearfix class to clear floats, the code specifications are unified, and it is easy to maintain and modify later.

However, CSS clear float 3 also has some shortcomings:

1. It is not as flexible as using the overflow attribute to clear float, and sometimes element overflow problems may occur.
2. The code is relatively verbose: Compared with other methods of clearing floats, CSS clearing floats 3 requires adding an additional class name to the parent element, and the amount of code is slightly higher.

5. Summary

CSS clearing floats is an important skill in Web front-end development. Clearing floats can solve problems such as element height collapse and overlap. Among the many ways to clear floats, CSS clear float 3 is the most commonly used method. Its advantages include simple implementation, good compatibility, and easy maintenance, but it also has shortcomings. I hope this article can bring some help to readers and be used properly in actual development.

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