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learn has and contains css selectors

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certainly! in css, selectors are patterns used to select the elements you want to style. among various selectors, the `:has()` and `:contains()` selectors are particularly useful for selecting elements based on their child elements or specific text content.

1. the `:has()` selector

the `:has()` pseudo-class is a powerful selector that allows you to select an element if it contains a specific child element that matches the criteria within the parentheses.

syntax:
```css
selector:has(child-selector) {
/* styles */
}
```

example:
let's say you have a list of articles, and you want to style the article that contains a specific tag (e.g., a `div` with the class `highlight`).

```html
!doctype html
html lang="en"
head
meta charset="utf-8"
meta name="viewport" content="width=device-width, initial-scale=1.0"
title:has() example/title
style
article:has(.highlight) {
border: 2px solid red;
background-color: lightyellow;
}
/style
/head
body
article
h2article 1/h2
divsome content here./div
/article
article
h2article 2/h2
div class="highlight"important content!/div
/article
article
h2article 3/h2
divanother piece of content./div
/article
/body
/html
```

in this example, only "article 2" will have a red border and a light yellow background because it contains a `div` with the class `highlight`.

2. the `:contains()` selector

the `:contains()` selector is not a standard css selector, but it is commonly used in jquery. it allows you to select elements that contain specific text. however, if you are looking for a css-only solution, there is no direct equivalent in css.

for those who want to achieve similar behavior, you'll need to use javascript.

example using jquery:
here's how you can use jquery to select elements containing specific text:

```html
!doctype html
html la ...

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