Example of styling the HTML <meter> tag with the CSS tarnsition property

Source Code: (back to article)

<!DOCTYPE html>
<html>
  <head>
    <title>Title of the document</title>
    <style>
      meter {
        width: 300px;
        height: 20px;
      }
      meter::-webkit-meter-bar {
        background: none;
        background-color: lightgrey;
        box-shadow: 0 3px 3px -3px #333 inset;
      }
      meter::-webkit-meter-optimum-value {
        -webkit-transition: width .5s;
        box-shadow: 0 5px 5px -5px #999 inset;
        background-image: linear-gradient( 90deg, #2286c9 5%, #FF00FF 5%, #FF00FF 15%, #04C319 15%, #04C319 55%, #F1F70D 55%, #F1F70D 95%, #00FFCC 95%, #00FFCC 100%);
        background-size: 100% 100%;
      }
      meter::-webkit-meter-optimum-value:hover {
        /* Reset each sub-category to 20% */
        background-image: linear-gradient( 90deg, #2286c9 20%, #FF00FF 20%, #FF00FF 40%, #04C319 40%, #04C319 60%, #F1F70D 60%, #F1F70D 80%, #00FFCC 80%, #00FFCC 100%);
        transition: width .5s;
        width: 100% !important;
      }
    </style>
  </head>
  <body>
    <meter value="25" min="0" max="70"></meter>
  </body>
</html>