<!DOCTYPE html>
<html>
<head>
<style>
@font-face {
    font-family: "WebFont";
    src: local("system-ui");
}
</style>
</head>
<body>
This test makes sure that <code>ui-sans-serif</code> matches <code>system-ui</code>.
<div style="font: 72px system-ui;">HeJllo</div>
<div style="font: 72px WebFont;">HeJllo</div>
</body>
</html>