Syntax usage scenarios of contain in CSS

Syntax usage scenarios of contain in CSS

In CSS, contain is a useful attribute used to specify whether the content of an element is independent of its external style and layout . It helps developers better control page layout and optimize performance. This article will introduce the syntax usage scenarios of the contain attribute and provide specific code examples. The syntax of the

contain attribute is as follows:

contain: layout|paint|size|style|'none'|'strict'|'content';

1. layout: Specifies whether the layout of the element is independent of other elements. When set to layout, layout performance can be improved. The sample code for using the contain attribute to achieve layout independence is as follows:

<style>
    .container {
        contain: layout;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

2. paint: Specifies whether the element is drawn independently of other elements. When set to paint, drawing performance can be improved. The sample code for using the contain attribute to achieve drawing independence is as follows:

<style>
    .container {
        contain: paint;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

3. size: Specifies whether the size of the element is independent of other elements. When set to size, size calculation performance can be improved. The sample code for using the contain attribute to achieve size independence is as follows:

<style>
    .container {
        contain: size;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

4. style: Specifies whether the style of an element is independent of other elements. When set to style, style calculation performance can be improved. The sample code for using the contain attribute to achieve style independence is as follows:

<style>
    .container {
        contain: style;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

5. none: Indicates that the contain attribute is not applied. The sample code using none is as follows:

<style>
    .container {
        contain: none;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

6. strict: Indicates that all contain functions are applied. The sample code for using strict is as follows:

<style>
    .container {
        contain: strict;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

7. content: Specifies whether the content of the element is independent of other elements. When set to content, content rendering performance can be improved. The sample code for using the contain attribute to achieve content independence is as follows:

<style>
    .container {
        contain: content;
    }
    .box {
        width: 100px;
        height: 100px;
        background-color: red;
    }
</style>
<div class="container">
    <div class="box"></div>
</div>

To sum up, the usage scenarios of the contain attribute in CSS can be optimized from aspects such as layout, drawing, size, style and content. . By setting the contain attribute, we can make an element independent of other elements in specific aspects, thereby improving the performance and efficiency of the page.

The above is the detailed content of Syntax usage scenarios of contain in CSS. For more information, please follow other related articles on the PHP Chinese website!