Using the margin-top property in CSS will only take effect if a border has been declared

Greetings,

I have been noticing a strange occurrence lately, and I finally decided to seek some answers. Below is a snippet of my basic HTML code:

<!DOCTYPE html>
<html>
<head>
  <meta charset="utf-8">
  <title>Page Title</title>
  <style>
    div{
      width: 200px;
      background: green;
    }    
    p{
      background: yellow;
      margin: 40px;
    }
  </style>
</head>
<body>
  <div>
    <p>Testing</p>
  </div>
</body>
</html>

As you can see, it's just a simple page with a div containing a paragraph. However, the CSS specifies a 40px margin for the paragraph within the div.

Oddly enough, the top and bottom margins are being disregarded. But when I add a 1px red border to the div, like so:

div{
  width: 200px;
  background: green;
  border: 1px solid red;
}

This is what happens:

Indeed, it seems quite peculiar to me. This issue occurs on Safari, but I suspect it may be present in other browsers as well. My question is, why does this happen? Is there any solution to correct it?

I appreciate your assistance.

Answer №1

It appears to me that you are witnessing a case of margins collapsing, for further insights, check out this resource

Answer №2

Incorporating the following into your CSS for the div should resolve the problem:

overflow: auto;

This simple adjustment should address the issue.

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