<!DOCTYPE html>
<html>
<head>
<style>
@font-face {
    font-family: DoesNotHaveBold;
    src: local("Times");
}
</style>
</head>
<body>
This test makes sure that the <code>ch</code> unit, which is supposed to be as wide as the <code>0</code> character, is in fact that wide, even if the font is using synthetic bold. The test passes if the width of the green box matches in both cases.
<div style="font: bold 16px 'DoesNotHaveBold'; background: green; width: 10ch; color: transparent;">a</div>
</body>
</html>