Your colleague gave the <span> element a width of 200px.
But <span> is an inline element and cannot be given a width.
Change the display of the <span> element so that it continues to be in the text and the width property works.

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index.html

<!DOCTYPE html>
<html>
  <head>
    <title>Inline elements</title>
    <style>
      span {
        font-weight: bold;
        width: 200px;
      }
    </style>
  </head>
  <body>
    <div>Created as an open source project and still utilized by Facebook, <span>React</span> is a popular JS framework that focuses on user experience. </div>
  </body>
</html>