为什么页面顶部有空白行?

问题描述：

我刚学习HTML/CSS了几天，但是遇到了麻烦: 为什么页面顶部有空白行?有人可以告诉我代码中有什么错误或遗漏吗?我该如何解决?

I've just learning HTML/CSS for a few days and I'm having trouble with this: Why there is a blank line at the top of the page? Can someone tell me what was wrong or missing from my code? How can I fix it?

这是我的代码:

<!DOCTYPE html>
<html lang="en">

<head>
  <meta charset="UTF-8">
  <title>Document</title>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
    
    header {
      text-align: center;
      background-color: lightgray;
    }
    
    header h1 {
      font-size: 70px;
    }
    
    ul {
      background-color: gray;
      padding: 10px;
    }
    
    li {
      display: inline;
      margin: 0 5px 0 5px;
    }
    
    a {
      color: white;
      text-decoration: none;
      text-transform: uppercase;
      font-size: 18px;
    }
  </style>
</head>

<body>
  <header>
    <h1>My Website</h1>
    <p>A sample website</p>
    <ul>
      <li><a href="#">HOMEPAGE</a></li>
      <li><a href="#">ABOUT ME</a></li>
      <li><a href="#">CONTACT</a></li>
    </ul>
  </header>
</body>

</html>

提前谢谢！

答

由于父母和第一个孩子

This occurs because of parent and first child margin collapsing between the h1 and the margin of its parent element(s)

一种解决方案是添加border: 1px solid lightgray或添加padding，或者您可以将margin本身重置为零-请参见下面的演示

One solution would be to add border: 1px solid lightgray or add padding, or you can reset the margin itself to zero - see demo below:

body {
  margin: 0;
  padding: 0;
}

header {
  text-align: center;
  background-color: lightgray;
  border: 1px solid lightgray;
}

header h1 {
  font-size: 70px;
}

ul {
  background-color: gray;
  padding: 10px;
}

li {
  display: inline;
  margin: 0 5px 0 5px;
}

a {
  color: white;
  text-decoration: none;
  text-transform: uppercase;
  font-size: 18px;
}

<header>
  <h1>My Website</h1>
  <p>A sample website</p>
  <ul>
    <li><a href="#">HOMEPAGE</a></li>
    <li><a href="#">ABOUT ME</a></li>
    <li><a href="#">CONTACT</a></li>
  </ul>
</header>

为什么页面顶部有空白行?

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