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HomeWeb Front-endCSS TutorialCan Sibling Combinators Target Pseudo-elements in CSS?

Can Sibling Combinators Target Pseudo-elements in CSS?

Sibling Combinators and Pseudo-Elements: Targeting Limitations

Can pseudo-elements be targeted using sibling combinators? A recent CSS issue has sparked this question.

In this scenario, an anchor tag with a preceding image should not display a pseudo-element. Targeting the anchor directly is not feasible due to the presence of the image. Therefore, an alternative approach using a sibling combinator on the pseudo-element was attempted, as shown below:

a[href^="http"]:after {
    content: "";
    width: 10px;
    height: 10px;
    display: inline-block;
    background-color: red;
}

a[href^="http"] img ~ :after {
    display: none;
}

However, the CSS fails to hide the pseudo-element when the anchor tag encloses an image. Why is this so?

The limitation lies in the nature of pseudo-elements. Generated content, including pseudo-elements, is not included in the DOM and doesn't affect the original document. This is explicitly stated in the CSS specification:

"Generated content does not alter the document tree. In particular, it is not fed back to the document language processor (e.g., for reparsing)."

Consequently, the sibling combinator cannot target a :before or :after pseudo-element since they are not part of the DOM structure.

For similar scenarios, consider using JavaScript to manipulate the DOM dynamically and achieve the desired styling effects.

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