how to use a article html

HTML
  <html>
<head>
<style>
.all-browsers {
  margin: 0;
  
  padding: 5px;
  background-color: lightgray;
}

.all-browsers 
  > h1, .browser {
  margin: 10px;
  padding: 5px;
}


  .browser {
  background: white;
}

.browser > h2,  
  p {
  margin: 4px;
  font-size: 90%;
}
</style>

  </head>
<body>

<article class="all-browsers">
  <h1>Most 
  Popular Browsers</h1>
  <article class="browser">
    
  <h2>Google Chrome</h2>
    <p>Google Chrome is a web browser 
  developed by Google, released in 2008. Chrome is the world's most popular web 
  browser today!</p>
  </article>
  <article class="browser">
    
  <h2>Mozilla Firefox</h2>
    <p>Mozilla Firefox is an 
  open-source web browser developed by Mozilla. Firefox has been the second most 
  popular web browser since January, 2018.</p>
  </article>
  
  <article class="browser">
    <h2>Microsoft Edge</h2>
    
  <p>Microsoft Edge is a web browser developed by Microsoft, released in 2015. 
  Microsoft Edge replaced Internet Explorer.</p>
  </article>

  </article>

</body>
</html>
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