The :has Pseudo-class

The “:has” pseudo-class is another experimental feature that is currently being proposed for the CSS Selectors Level 4 specification. It is similar to the “:where” pseudo-class, but it allows you to style elements based on the presence of a specific descendant element. This means you can select an element based on whether or not it has a particular child or grandchild.

The basic syntax for the “:has” pseudo-class is as follows:

element:has(descendant-selector) {
    /* styles */
}

One of the main advantages of using the “:has” pseudo-class is that it allows you to apply styles to an element based on the presence of a specific descendant element. For example, you can use the “:has” pseudo-class to change the background color of a container element when it has a specific child element:

.container:has(.highlight) {
    background-color: yellow;
}

This code will select all container elements that have an element with the class “highlight” as a descendant and apply the background-color yellow.

You can also combine “:has” with other pseudo classes and selectors to get more control over the styling of your element. For example, you can use it to style a button only when it contains a specific icon:

button:has(i.fa-check) {
    background-color: green;
    color: white;
}

In summary, the “:has” pseudo-class is an experimental feature that provides a powerful way to select and style elements based on the presence of a specific descendant element. It allows for greater control over the styling of elements and can make it easy to create complex interactions, but it’s important to keep in mind that it is currently experimental and not widely supported. As a developer, it’s important to stay up to date on new features like this and be ready to use them when they become more widely adopted.

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