Why is first-Child selecting the <p> element?

Question

Why is first-Child selecting the <p> element?

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<!doctype html>
<html lang="pt-br">
<head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        :first-child {
            border: 1px solid red;
        }
    </style>
</head>
<body>
    <p>Este é um parágrafo.</p>
    <p>Este é um parágrafo.</p>
    <p>Este é um parágrafo.</p>
</body>
</html>

In the example above the first-child is selecting and applying an edge to the element <body> and in the element <p> because this is happening wasn’t just for the element body receive the border since it is the first child element of the document?

Note: in the stackoverflow does not work has to be in a separate document.

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by Gabriel Orlando • 58 points · Answer 1 · 2020-01-29T00:34:24+00:00

You will need to identify to which element first-Child will be applied. In this case, as you did not specify, he applied to the body.

Try the following code:

p:first-child {
        border: 1px solid red;
    }

In this case, the border shall be applied to its first paragraph.

If you want your edge to be applied to the body, try using

body{
  border: 1px solid red;
}