<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
</head>
<body>
This test makes sure that overlines grow upward. The test passes if the top line below has the default thickness.
<div style="font: 48px 'Ahem'; text-decoration: overline; overflow: hidden; text-decoration-thickness: 10px;">pppp</div>
</body>
</html>