CodePen Embed - js-document-queryselector

<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width">
    <title>repl.it</title>
    <link href="index.css" rel="stylesheet" type="text/css" />
  </head>
  <body>
    <h1 class="blue">
      <span>난 span</span>
      여기만 바꾸고 싶어
    </h1>
    
    <script src="index.js"></script>
    
    
  </body>
</html>

.blue {
  color: white;
}

let blueElement = document.querySelector('.blue');
blueElement.style.backgroundColor = 'blue';

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External JavaScript

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