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How to set weight in css

青灯夜游Original: 2021-07-01 17:35:1510705browse

In CSS, you can use the "!important" statement to set the weight, which provides developers with a way to increase the weight of the style; the syntax format is "property:property value !important;". The "!important" statement is a declaration of the entire style, including the attributes and attribute values of this style.

The operating environment of this tutorial: Windows 7 system, CSS3&&HTML5 version, Dell G3 computer.

CSS weight

refers to the priority of the style. If there are two or more styles acting on an element, the one with the higher weight will Styles work on elements. If the weight is the same, the style written later will override the style written earlier.

Level of weight

(1) !important, added after the style attribute value, the weight value is 10000

(2) Inline style , such as: , the weight value is 1000

(3) ID selector, such as: #content, the weight value is 100

(4) Class, pseudo-class and attribute selection The weight value of label selectors and pseudo-element selectors, such as: content, :hover, is 10

(5). The weight value of label selectors and pseudo-element selectors, such as: div, p, :before, is 1

(6 ) Universal selector (*), child selector (>), adjacent selector (), sibling selector (~), weight value is 0

How to set the weight in css?

In CSS, you can use the "!important" statement to set the weight, which provides developers with a way to increase the weight of the style.

css weight value (overlap) example

There are many selectors in css, which will work on multiple selectors What will be the effect if the same element is used? Code

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      p{
        color:red;
        font-size: 10px;
      }
      #wrap{
        color: deeppink;
        font-size: 30px;
      }
      .box{
        color:yellow;
        font-size: 50px;
      }
    </style>
  </head>
  <body>
    <p id="wrap">
       猜猜我是什么颜色
    </p>
  </body>
</html>

can be executed and the result will be
Summary: This effect occurs because the browser determines which css style to use based on the weight value. The higher the weight value, the higher its priority will be, and the css style and the weight value of the id selector will be displayed. For 100>Class Selector 10>Tag Selector 1, so the final result is the style set by the id selector
List 2 Code

!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      *{
          color: cyan;
      }
      div {
          color: yellow;
      }
    </style>
  </head>
  <body>
    <div>
        <p id="wrap">
        猜猜我是什么颜色
        </p>
    </div>
  </body>
</html>

Execution results

Summary: Inherited elements have no weight value, so the final result is set by the universal selector Style
Example 3 Code

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      p{
          color: yellow;
      }
      *{
          color: cyan;
      }
    </style>
  </head>
  <body>
    <div>
        <p id="wrap">
        猜猜我是什么颜色
        </p>
    </div>
  </body>
</html>

Execution result
Summary: The weight value of the tag selector is 1, but it is still greater than the universal selector, so the final result is the style set by the tag selector
Example 4 Code

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      div p{
          color: yellow;
      }
      div>p{
          color: cyan;
      }
      p{
          color: red;
      }
    </style>
  </head>
  <body>
    <div>
        <p id="wrap">
        猜猜我是什么颜色
        </p>
    </div>
  </body>
</html>

Execution Result

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title></title>
    <style type="text/css">
      div>p{
          color: cyan;
      }
      div p{
          color: yellow;
      }
      p{
          color: red;
      }
    </style>
  </head>
  <body>
    <div>
        <p id="wrap">
        猜猜我是什么颜色
        </p>
    </div>
  </body>
</html>

!important Example of increasing weight value

When we are doing web page code , there are some special situations where it is necessary to set the highest weight value for certain styles, what should I do? For example, we know that the weight value of the inline style is 1000, which is relatively large, then we can use !important to solve it.

76c82f278ac045591c9159d381de2c57
100db36a723c770d327fc0aef2ce13b1
    93f0f5c25f18dab9d176bd4f6de5d30e
        a80eb7cbb6fff8b0ff70bae37074b813
        b2386ffb911b14667cb8f0f91ea547a7!important的使用6e916e0f7d1e588d4f442bf645aedb2f
        46d5fe1c7617e3914f214aaf043f4ccf
            div{
                color:green !important;
            }
        531ac245ce3e4fe3d50054a55f265927
    9c3bca370b5104690d9ef395f2c5f8d1
    6c04bd5ca3fcae76e30b72ad730ca86d
        afc4380047850c27da0e1725edddceea
            45a2772a6b6107b401db3c9b82c049c2猜猜我是什么颜色54bdf357c58b8a65c66d7c19c8e4d114
        16b28748ea4df4d9c2150843fecfba68
    36cc49f0c466276486e50c850b7e4956
73a6ac4ed44ffec12cee46588e518a5e

weight value comparison rules
inherent in the style sheet, making it more difficult to debug bugs. When two conflicting rules with !important apply to the same tag, the one with the highest priority will be used.

Under what circumstances can !important be used?

There is a css file on your website that is designed to style the whole site
- At the same time, you or your friends have written some poor inline styles
```
box p { color: blue; } p.awesome { color: red; }
```
How can I make the text color red? In this case, if !important. does not apply, the first rule will always be greater than the second rule.

Summarize

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How to set weight in css

inherent in the style sheet, making it more difficult to debug bugs. When two conflicting rules with !important apply to the same tag, the one with the highest priority will be used.

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