How to Select a Previous Sibling Element With :has() in CSS

Up until recently, CSS lacked a selector for an element's preceding sibling. Now, with the :has() selector, we can access this element.

Consider the following HTML:

<div class="capped-input">
  <div class="input-cap">{{mpwD56ij8Q4NyUvO:C4UQGTRU}}lt;/div>
  <input type="number" name="amount" placeholder="Dollar Amount" />
</div>

If we want to style the .input-cap <div></div> when the input is focused, we can use :has() to target it:

.input-cap:has(+ input:focus) {
  background: blue;
}

Now, when the amount input is focused by the user, the background of the .input-cap element will be set to blue.

Browser Support

As of 2023, the :has() selector is considered to have baseline support across all major, modern web browsers.