a45.html

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>

    <style>

        #a {
            text-decoration-line: underline;
            text-decoration-color: red;
            text-decoration-style: dashed;            
            text-decoration-thickness: 5px; 
        }

    </style>
</head>
<body>
    
    <span id="a">Some text to demonstrate the concept</span> <br><br>

</body>
</html>