<!DOCTYPE html>
<html>
<head>
    <link rel="author" title="Tyler Wilcock" href="mailto:twilco.o@protonmail.com"/>
    <meta name="assert" content="There is a 50px solid green border line around all sides of the div." />
    <style>
        div {
            width: 100px;
            height: 100px;
            border-block-start: 50px solid green;
            border-block-end: 50px solid green;
            border-inline-start: 50px solid green;
            border-inline-end: 50px solid green;
        }
    </style>
</head>
<body>
    <div>
    </div>
</body>
</html>