<!DOCTYPE html>
<html>
<!--
 | Apply overflow hidden and opacity at the same time.
 |   https://www.w3.org/TR/CSS21/visufx.html
 -->
<head>
  <style>
    body {
      font-family: Roboto;
      font-size: 16px;
    }

    .hidden {
      width: 330px;
      height: 20px;
      overflow: hidden;
    }

    .opacity {
      opacity: 0.5;
    }
  </style>
</head>
<body>
  <div class="hidden opacity">
    <div> Demonstrate overflow hidden and opacity. This line with opacity 0.5. </div>
  </div>
</body>
</html>