CSS Containment Training and Its Application in Real Projects

Exploring CSS Containment

CSS Containment is an important feature of CSS content that allows web developers to improve the rendering performance of web pages, especially on pages with complex content. In fact, this feature specifies which parts of a page do not affect other parts. This feature has several different nuances that allow you to provide different surfaces of independence for elements.

When designing various complex pages, utilizing CSS Containment can help you achieve stability that changes in one part of the page do not affect the overall structure of the DOM. By employing this technique, you can enhance the performance of the site itself.

CSS Containment properties include three main types: content, size, and style. For example, if you want to limit some of the rendering elements to achieve better performance, you can use properties and sizes for this task.

When configuring a complex web project, structured and using this feature can help reduce the processing load on the browser. Therefore, for pages that have animations and multiple effects, Containment can be a helpful tool.

Please note that all browsers do not support this feature. Therefore, before using it, you should check whether the browser you intend to use this feature is supported or not.

Example CSS Containment Code

div.container {
  contain: layout paint;
  width: 100px;
  height: 100px;
  background-color: lightblue;
}

Code Explanation

div.container: the selected div that has the class container.
contain: layout paint;: using the contain property to employ layout and paint limitations for performance improvement.
width: 100px;: specifying the width of 100 pixels for the element.
height: 100px;: specifying the height of 100 pixels for the element.
background-color: lightblue;: setting the background color of the element to light blue.