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html - Why my sticky navigation only works when my header is set to be inline?

in Technique[技术] by (71.8m points)

This is my HTML file:

    .jumbotron {
       font-size: 20px;
       padding: 60px;
       background-color: #00a8ec;
       text-align: center;
       color: white;
    }
    
    header {
       display: inline;
    } 
    
    nav {
       background-color: #00b2a6;
       padding: 5px;
       position: sticky;
       top: 0;
    }
    
    footer {
        padding: 20px;
        color: white;
        background-color: #00b2a6;
        text-align: center;
        font-weight: bold;
     }
<!DOCTYPE html>
    <html>
        <head>
            <title>TITLE</title>
            <link rel="stylesheet" href="tes.css">
        </head>
        <body>
            <header>
                <div class="jumbotron">
                    <h1>TITLE</h1>
                    <p>DESCRIPTION</p>
                </div>
                <nav>
                    <ul>
                        <li><a href="#sejarah">Sejarah</a></li>
                        <li><a href="#geografis">Geografis</a></li>
                        <li><a href="#wisata">Wisata</a></li>
                    </ul>
                </nav>
            </header>
    
            <main>
                <div id="content">
                    <pre>Hahahaha
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                    </pre>
                        
                </div>
    
              
            <footer>
                <p>FOOTER</p>
            </footer>
            
        
        </body>
    
    </html>
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1 Answer

by (71.8m points)

You find a hack to force it to work. When using inline you will have block level elements inside inline level element one which is invalid and it's like the inline element no more exist (this is a simplified explanation, in reality it's a bit more complex1).

Your code is exactly like not having header:

.jumbotron {
  font-size: 20px;
  padding: 60px;
  background-color: #00a8ec;
  text-align: center;
  color: white;
}

nav {
  background-color: #00b2a6;
  padding: 5px;
  position: sticky;
  top: 0;
}

footer {
  padding: 20px;
  color: white;
  background-color: #00b2a6;
  text-align: center;
  font-weight: bold;
}
<div class="jumbotron">
    <h1>TITLE</h1>
    <p>DESCRIPTION</p>
  </div>
  <nav>
    <ul>
      <li><a href="#sejarah">Sejarah</a></li>
      <li><a href="#geografis">Geografis</a></li>
      <li><a href="#wisata">Wisata</a></li>
    </ul>
  </nav>


<main>
  <div id="content">
    <pre>Hahahaha
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                        Hahahaha
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                        Hahahaha
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                    </pre>

  </div>


  <footer>
    <p>FOOTER</p>
  </footer>

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