Pseudo-class of CSS: how to use focus-within
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.
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