mask-opacity-1-ref.html

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<!DOCTYPE html>

<html>

  <head>

    <meta charset="utf-8">

    <title>CSS Masking: mask-image: mask with opacity</title>

    <link rel="author" title="CJ Ku" href="mailto:cku@mozilla.com">

    <link rel="author" title="Mozilla" href="https://www.mozilla.org">

    <style type="text/css">

      div {

        position: absolute;

        left: 10px;

        top: 60px;

        background-color: rgba(0,0,255,0.5);

        width: 100px;

        height: 50px;

    </style>

  </head>

  <body>

    <div></div>

  </body>

</html>