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This article introduces the knowledge of "pseudo-class of CSS: how to use focus-within". In the operation of actual cases, many people will encounter such a dilemma, so let the editor lead you to learn how to deal with these situations. I hope you can read it carefully and be able to achieve something!

CSS pseudo-class: focus-within, can be very convenient to deal with the focus state.

Elements of the: focus-within pseudo-class are valid when the element itself or its descendants gain focus.

If you don't understand, you can look at the following example:

Enter text

. container:focus-within {

Background-color: # aaa

}

If div.container gets the focus, there will be a # aaa background color. And if its descendant element gets focus, its background color also changes, so when it receives focus, the background color of div is still # aaa.

In this way, we do not need to implement such a function when we always use JavaScript, which is very convenient for developers.

So much for the introduction of "pseudo-classes of CSS: how to use focus-within". Thank you for reading. If you want to know more about the industry, you can follow the website, the editor will output more high-quality practical articles for you!

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