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Test Info:

<html>
<head>
<script>
function start () {
const font_1 = new FontFace('m', 'url()', {})
const font_2 = new FontFace('', '')
document.fonts.add(font_1)
font_1.family = 'f'
document.fonts.add(font_2)
}
window.addEventListener('load', start)
</script>
</head>
</html>